100句搞定高考7000词:第99期

所属专题:100句搞定高考英语7000词汇  来源:沪江部落    要点:100句搞定高考核心词汇  
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【句子】

It has been found that certain bats emit squeaks and by receiving the echoes, they can locate and steer clear of obstacles------or locate flying insects on which they feed. This echo-location in bats is often compared with radar, the principle of which is similar.

人们已经发现,某些蝙蝠发出尖叫声并靠接受回响来锁定和避免障碍物——或者找到它们赖以为生的昆虫。蝙蝠这种回响定位法常拿来和原理与之很相近似的雷达相比。

【解析】

1.emit

1)vt. 散发,放出,发出(气味、光、热、粒子等)

The sun emits light.

太阳放出光。

the refreshing fragrance emitted by perfumes

香水发出的令人清爽的香味。

2)vt.喷出,喷射,排出(液体、气体等):

Geysers emit water.

间歇温泉喷出水来。

The chimney emitted smoke.

烟囱冒烟。

3)vt.发出(声音等)

She emitted one shrill cry and then was silent.

她发出一声尖叫,然后沉默了

4)发行(纸币、书报等) ;发表(意见等)

Jack emitted a curse.

杰克诅咒了一声。

2.squeak

1)n. 短促的尖叫声,吱吱的叫声;尖厉刺耳的噪音 ;[口语]幸免于难,死里逃生,脱险

These mice were also more likely than control mice to emit ultrasonic squeaks—a type of mouse love song—toward other males.

试验鼠也比对照组发出更多的超声波级别的尖叫声——一种对其他雄鼠的情歌
2)vi. 发出短促的尖叫声,吱吱叫;发出尖厉刺耳的噪音

The milk cart squeaked out of the village.

运奶车吱吱地响着慢慢驶出了村子。

3)vi.[口语]勉强通过;勉强应付;险胜(by, through)

to squeak through one's maths exam

数学考试勉强及格

I know I'll be confronted with difficulties, but I will squeak by anyway.

我知道我会遇到许多困难,可我无论如何总能应付过去。

4)vt. 使发出吱吱声,使嘎吱作响;使尖叫

She squeaked out a cry at the sight of a shadow.

她被一个黑影吓得尖叫起来。

5)vt.尖声说出,以尖厉的声音发出(out)

to squeak out curses

尖声叫骂

The zebra squeaked out shrill cries as it was caught by a lion.

斑马在被狮子抓住时,发出了凄厉的叫声。

3.echo

1)n. 反响,回响;回声,回音 ;[有时用复数]反响;后果

The echoes died [faded] away.

回声消失了。

2)vi.发出回声,产生回响,反响,起反响,回响;回荡;(声音)被传回;起共鸣

The hall echoed with cheers.

欢呼声响彻大厅。

3)vi.被重复,重复别人的话语(或思想、感情、行动等);仿效别人的风格(或谈吐等),被仿效:

Shouts echoed through the street.

喊叫声在街上回荡。

4)vt.发射(声音等),发出…的回声

The big ball echoes the faintest sounds.

最微小的声音在这大厅里也会产生回响。

5)vt.重复(或模仿)(别人的)话(或思想感情等);(随声)附和

The pupil echoed his teacher's words.

小学生重复老师的话。

They echoed every word of their leader.

他们随声附和他们领导人的每句话。

6)vt.类似;与…相似,像

The student and his teacher echoed each other in writing style.

学生和他老师在创造风格方面彼此相似。

4.steer

1)vt.把掌…的舵;驾驶,操纵(飞机、汽车等):

to steer a plane 驾驶飞机

to steer a car 驱车

to steer a bicycle 骑自行车

2)vt.沿着(某方向)前进;采取…的方针

We steered a correct defence policy.

我们采取了正确的防御方针。

3)vt.[口语]指导,引导;操纵,控制

I can steer you to the best hotel in the city.

我可以把你带到本市最好的饭店。

to steer someone in his English study

指导某人学习英语

4)vi.掌舵,驾驶飞机(或汽车等);(车、船、飞机等)被驾驶;驾驶起来

He steered out of the expressway and then let me drive his car.

他把车驶出高速公路,然后让我驾车。

5)同根词

词根: steer
adj.

steerable 易驾驶的;可操纵的;易改变位置的
n.

steering 操纵;指导;掌舵

steerage 统舱;舵效;操舵;驾驶;管理;士官的二等室

steerer 舵手;司机,驾驶者
v.

steering 驾驶;掌舵(steer的ing形式)

【今日练习】

1、They _________ high frequency pulses of sound through their mouth or nose which bounce off surfaces and objects around them.
A.deliver
B. emit
C.issue
D.ray

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