[学习方法]100句搞定高考7000词

【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. Thisecho-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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