Conception occurs when a single sperm fuses with an egg.
当一个精子和一个卵子结合时受孕就发生了。
The child was killed when a car failed to stop at the crossing.
汽车在人行横道线未能停车，结果把小孩撞死了。
What does one do when a government simply refuses to listen to the voice of the opposition?
当政府完全拒绝倾听反对意见时，那该怎么办？
What happens when a language dies out?
当一种语言消失时会发生什么？
Only when a juggler misses catching his ball does he appeal to me.
只有在一个变戏法的人接不到球的时候，他才能吸引我。
Students have to be the ones reminding themselves of when a mid-term will be.
学生需要提醒自己什么时候要进行期中考试。
We laugh when a great satirist like Swift writes about war in Gulliver's Travels.
当像斯威夫特这样伟大的讽刺作家在《格列佛游记》中描写战争时，我们会大笑。
The ritualized visual display communicates in close quarters when a female has approached.
当一个女性靠近时，这种仪式化的视觉展示会在近距离内进行交流。
There was confusion when a man fired shots.
一名男子开了枪，出现了混乱。
More than 70 people were killed in the floods, caused when a dam burst.
大坝决堤引发的洪水灾吞噬了七十多人的生命。
Institutions tend to close ranks when a member has been accused of misconduct.
各个机构在其某一成员被指控行为不当时都会同心合力。
Five firemen narrowly escaped death when a staircase collapsed beneath their feet.
一段楼梯在他们脚下坍塌时，五名消防队员险些丧命。
I was just sitting there, minding my own business, when a man started shouting at me.
我就坐在那儿，也没招谁惹谁，忽然有个男人对我大喊大叫。
When a drug pusher offered the Los Angeles youngster $100 to peddle drugs, Jack refused.
当一名毒贩子给这位洛杉矶小伙子杰克$100让他贩卖毒品时，他拒绝了。
Attention was first drawn to the book when a condensed version was serialized in The New Yorker.
这本书的缩写本在《纽约人》上连载时首次引起了人们的注意。
At least six people were killed and about twenty injured when a train was derailed in an isolated mountain region.
火车在一片偏僻的山区脱轨，导致至少六人死亡，约二十人受伤。
This happens when a plant gets attacked by insects.
植物被昆虫攻击时就会发生这种情况。
When a person shouts, he cannot pronounce his words well.
一个人大喊大叫时就不能好好发音。
A fingerprint is formed when a finger touches a surface.
当手指接触一个表面时就形成了指纹。
Good luck is when a chance comes and you're prepared for it.
好运就是当机会来临时，你做好了准备。
When a bottle is empty, it will be thrown away as waste.
当一个瓶子空了，它将被当作废品扔掉。
What will the police do when a drone find people in groups?
当无人机发现人群聚集时，警方会做什么？
It's a proper time to start it when a unit is over.
一个单元结束时是开始这件事的合适时间。
The boy was busy doing his work when a heavy rain began.
那男孩正忙着干活，突然下起了大雨。
Did the writer teach us what to do when a fire breaks out?
作者教过我们发生火灾时该怎么办吗?
When a lion wakes from his dream, I suddenly knew what competition was.
当狮子从梦中醒来的时候，我突然明白了什么是竞争。
In China, when a visitor comes, he is served with a cup of tea.
在中国，当有客人来访时，会给他端上一杯茶。
A woodcutter was walking through the forest when a small tree called to him.
一个樵夫正穿过森林，这时一棵小树向他呼喊。
When a whale dies, it quickly drops to the bottom of the ocean floor.
鲸鱼死亡后，很快就会沉入海底。
When a piece of fruit gets too heavy, it falls from a tree to the ground.
当果实过于沉重时，它就会从树上掉到地上。
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