不佳。〇 note at regard I旧NJ This pattern is
usually used in the passive.此句型通常用于被4语牵。 per Cent (especially
Br£) [NAmE
usually pe^-cent)
/pa
'sent; NAmE^r 'sent/ [symb %) noun, adj., adv. m noun {pi. per cent, per-cent) one part in every
hundred 百分之…：Poor/amiZies spend
about 80 to 90 per cent 〇/their income on/ood.贫困家庭大约花费收入的80% 到 90% 购买食物。◊ ft is o_/iten stated that we use onZy K) per cent oj7
our brain.常有报告称人只运用了大脑南
10%。 ◊ What per cent 〇/ the
popuZariorz is/are over
weight? 体重超重的人占人口多大的百分比.?
by in or for every
hundred 每一百中：a 25 per cent
rise in price 15% 0
House prices rose
hve per cent iast year.去年房价上涨百分之五。
percent-age/p8'sentid3； A/Amf par's-/ noun
1 [C+sing./ pi. v.]
the number, amount, rate of sth, expressed as if it is part of a total which is
100; a part or share of a whole 百分率；百分比：What percentage 〇/ the
popuZa- tion is/are overweight?身体超金:的人占人口多大的百分
比？ ◊ A high percentage of the female staff are part-time workers.女职员中，兼职工作的人占很高的比例。◊ Interest
rates are expected to rise by one percentage point (= one per cent).利率预计将提髙一个百分点。◊ rhe_/iigure is
expressed as a percentage.数字是用百分率 表示的。◊ The resuZts were anaZysed £n percentage terms•结果是按百分比分析的。2 [C，usually sing.] a share
of the profits of sth 初润的分成；提成：He gets a percentage /or every
car so〖d.他每售出一辆车便可得到一
份提成。
GRAMMAR POINT语法说明
expressing percentages百分比的表示法
Percentages (= numbers of per cent) are
written in words as twenty-five per cent and in figures as 25%. If 分比用文字表示为twenty-five per cent，用数字表示为
25% 〇
If a percentage is used with an
uncountable or a singular noun the verb is generally singular•百分比与 不可数名词或单数名词连用时，动词一般为单数：90% 〇/ 沩e /tint/ /s
cw/t/Vflto/. * 90% 的土地B耕种。
If the noun is singular but represents a
group of people, the verb is singular in NAmE but in BrE
it may be singular or plural.如果是单数集合名词，北美英语
动词用单数，英国英语用单、复数均可：
cent of the workforce is/are against the strike.
八十的劳动力都反对这次罢1。
If the noun is plural, the verb is plural.如果名词为复’
数，动词 _
复数：65% of children play computer gflmes. * 65%的孩于舞电脑游戏。
percentile /pa'sentail; NAmE par's-/
noun [technical 语）one of the loo equal
groups that a larger group of people can be divided into, according to their
place on a scale measuring a particular value 百分位数：Overall these students
rank in the 21st percentile on the tests— that is, they
did worse than 79 per cent of all children taking the test.这些考生的总体百分位排名占第21位。 就是说，7^%的应试儿童比他们考得好。
per-cep-tible /pe'septabl; NAmE par's-/
adj. {formal)
1
great enough for you to
Notice it 可察觉到南；看得出
的 Pn71 noticeable ： a perceptible
change/increase/ dedi’ne/impact可以察觉的变化/增长/下降/影响◊ The price
increase has had no perceptible effect on sales. 提价没有对销售产生明显的影响。◊ Her/oreign
accent was barely perceptible.她的外国口音几乎听不出来。
2
[technical that
you can notice or feel with your senses可感‘的；可感觉的：the perceptibie worW可感 知的世界 PT?3
imperceptible ►
per.cep.tibly /-abli/
adv. ： Income per head rose
percepriWy.各人的收入明& 提高了。◊ Jt was
perceptiWy coWer.天气明显地洛了。
perception /pa'sepjn; NA)vE par's-/ noun 1 [U] (formal or technical 7|t i^) the way you
notice things, especially with the senses 知觉；_ 知：our perception of reality 我们对现实的认识◊ visual
perception彳觉一see also extrasensory
perception 2 [U] (format) the
ability to
1473
understand the true nature of
sth 洞察力；悟性 Pnm
insight： She showed
great perception in her assessment 〇/the/amiiy si’tuarion.她对家庭叙况的分析显示出敏锐
侖洞察力。3 [U，.C]〜(that ... ) (fomifl/) an idea，a belief or an image
you have as a result of how you see or understand sth 看法；■见解：a campaign to change
puWic perception 〇/the poHce改变警察公众形象的运动◊ There is
a general public perception that standards in schookay/affing.公众普遍认为，学校的水平都在下降。
per-cep-tive /pe'septiv; NAmE par's-/ adj. 1 (approving) having or showing the
ability to see or understand things quickly, especially things that are not
obvious M. 解力强的；有洞察力的；思维敏捷的：ahigWypercejp- tive
comment 见地高明的评论◊ Jt was very
perceptive 〇/ you
to notice that.你能士意到此事，資够敏锐的。
3
connected with seeing, hearing and
understanding 视觉的；听觉的；感觉的；知觉的：our fnrnzte perceptive
abiHties我们天生的五官感觉能力►
percep.tive.ly adv. per-cep-tive-ness noun [U]
per-cep-tron /pa'septron; NAmE par'septrain/ noun (computing if) an artificial network which is
intended to copy the brain’s ability to recognize things and see the
differences between things感知机（模拟大脑识别事物
和差异的人工网络)
per-cep-tual /pa'septjual; NAmE par's-/ adj. [only before noun] (technical 7(tT|-) relating to
the ability to perceive things or
the process of perceiving，知觉的;.感知的：
perceptual
sfcrtk 知觉技能
perch /p3：tj; NAmE p3：rtj/ verb, nouh
■
1 [V] ~ (on sth) (of a bird 鸟）to land and stay on a
branch, etc.栖息；奋留：A robin was perching
on the /ence•—只知更鸟落在舍笆上。2〜(sb/yourself) (on sth) [informal) to sit or to make sb
sit on sth, especially on the edge of it (使）坐，坐在…边沿：[V] We
perched on a coupZe o/high stooZs at the bar.我们坐在酒吧的几个高
脚凳上。◊ [VN] She
perched herseZj on the edge 〇/ the
bed•她金在床沿上石 c>
note at sit 3 [V] ~ (on sth) to
be placed on. the，top or the edge ..of sth 置于（顶上或边
上■)
: The hotel perched precariously on a steep
hillside. 旅店立在陡峭的山坡上状似摇摇欲坠。
■
noun 1 a
place where a bird rests, especially a branch or bar for this purpose, for
example in a bird’s cage
(鸟的）栖息处，栖木2 a high seat or
position高座；
He
watched the game from his precarious perch 〇/the vvaH.他无视安全，高坐在墙头上观看比赛。
4
{pi. perch) a freshwater fish that is sometimes used
for food _鱼 j■河辦 see knock v.
perchance /pa'tJaTis; NAmE par'tjaens/ adv. [old use) perhaps 也许；可
perched /p3：tjt; NAmE p3：rtXt/ adj. ~ on, etc. sth 1 (especially of a bird 尤指鸟）sitting or resting on sth 栖息；停留：There was a bird
perched on the roo/•有一
只鸟落在屋顶上。.：2 placed in a high
and/or dangerous position 被置于i处（或危险处）：a hotel perched high on t/ie ch:拆高高矗立在悬崖上的旅馆
per.cipi.ent /pa'sipiant; NAmE par's-/ adj. (formal) having or showing the ability to
understand things, especially things that are not obvious 敏锐的；理解透彻
的；明察秋毫的ECC1 PERCEPTIVE per-co-late /'p3：kaleit; NAmE 'p3：rk-/ verb 1 [V]
(of a liquid, gas, etc.液体、气体等）to move gradually
through a surface that has very small holes or spaces in ■ it 渗入；渗透；渗漏：Water had percolated
down through the rocfo. 7jC从岩缝间渗漏下去〇 2 [V] to gradually become known or spread through a
group or society 逐渐流传；传开：Jt had jpercokited
through to us that something interesting was about to happen•我们听 到传言说，将要发生一件有趣的事。3 [VN,V] to make coffee in a percolator; to be made in this way
.(用渗滤
式咖啡壶）滤煮；滤煮咖啡►per<o«la*tion/,p3:ka_leiJ'n;
NAmE ,p3：rk-/ noun [U]
perco*la-tor /'p3：k8leit0(r); NAmE 'p3：rk-/ noun a pot for making coffee, in which boiling
water is forced up a central tube and then comes down again through the coffee渗滤式咖啡壶