There was complete anarchy in the classroom when their usual teacher was away.
任课老师不在时，班上一片混乱。
He is one of the reservists who will plead not guilty when their cases come up.
他是其中一个在案件审理时将申辩无罪的后备役军人。
It will come as a rude shock when their salary or income-tax refund cannot be cashed.
如果他们的薪水或所得税返还不能兑现，那对他们将是一个晴天霹雳。
They were cut off from the West in 1948 when their government closed that border crossing.
当他们的政府于1948年封锁了那个那个边境通道以后，他们与西方国家的联系就被切断了。
They were on their way to the airport when their van was involved in a collision with a car.
他们正往机场赶路的时候，其货车和一辆小汽车相撞了。
That the pair won when their rivals were terrific too is also impressive.
这对搭档在他们的对手也很棒的情况下获胜，这也令人印象深刻。
For old people, a dog is also a child when their real children have grown up and left.
对于老年人来说，当他们真正的孩子长大离开时，狗也能成为他们的孩子。
When their voices died away there came cold silence over the lagoon, and then a feeble cry.
当他们的声音渐渐消失的时候，泻湖上空出现了冰冷的寂静，接着是一声微弱的哭声。
Others have been stranded at the sea when their scooters either failed or sank far from shore.
另一些人因为他们的水上摩托车失灵或在远离海岸的地方沉没而被困在海上。
Thousands of bees left a town after landing on the back of a car when their queen got stuck in its boot.
蜂后被困在汽车的后备箱里时，成千上万只蜜蜂飞到车后，跟随这辆车离开了这个小镇。
She and her husband started out limiting TV time when their kids were little, but then technology crept in.
她和丈夫在孩子很小的时候就开始限制他们看电视的时间，但是突然间，科技产品悄悄来临。
It follows that melon plants have a lower-than-usual rate of photosynthesis when their roots are in rain-soaked soil.
因此，当瓜类植物的根在雨水浸湿的土壤中时，它们的光合作用率低于通常水平。
When their stepmother opened it, she exclaimed, "You naughty children, why have you been staying so long in the forest?''
当他们的继母打开它时，她喊道：“你们这些淘气的孩子，为什么在森林里呆这么久？”
It was important to the ancient Egyptians to know when their Nile based seasons would occur, their way of life depended upon it.
对古埃及人来说，知道尼罗河季节的时间是很重要的，他们的生活方式取决于尼罗河季节什么时候来临。
They are more likely than women to cry when their core identities—as providers and protectors, as fathers and fighters—are questioned.
当他们作为供养者和保护者、父亲和战士的核心身份受到质疑时，他们比女性更容易哭泣。
Most mammals reach sexual maturity when their growth rates are in recession, while humans experience a growth spurt during adolescence.
大多数哺乳动物达到性成熟时，它们的生长率处于衰退状态，而人类则在青春期经历性成熟的激增。
The researchers discovered that the number of risks teens took more than doubled when their friends were watching, compared with when they played alone.
研究人员发现，与单独玩耍时相比，青少年在朋友旁观时所承担的风险是前者的两倍以上。
Individual specimens of Allende are covered with a black, glassy crust that formed when their exteriors melted as they were slowed by Earth's atmosphere.
每块阿伦德碎片样本都覆盖着一层黑色的、玻璃样的熔壳，这层熔壳是在它们的外表面与地球大气层摩擦减速中熔化形成的。
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