Just when this will happen is anyone's guess.
谁也拿不准这件事什么时候会发生。
I'll be glad when this job is over and done with.
这个工作彻底完成后我就高兴了。
Can you quote me an instance of when this happened?
你能否给我举例说明一下发生这事的情况？
I was walking out to my car when this guy tried to mug me.
这家伙企图抢劫我的时候，我正向我的汽车走去。
How do we know when this figure was carved?
我们怎么知道这个雕像是什么时候雕刻的呢？
When this occurs, the prey population can rebound.
当这种情况发生时，猎物的数量就会反弹。
When this happens, they will tear up the contract.
如果这事发生，他们将会违约。
Why don't we know the exact date when this head was made?
为什么我们不知道这个头像制作的确切日期呢？
So when this was first found, people literally would not believe it.
所以当这被第一次发现时，人们简直不敢相信。
He was far from hating Tom the less when this thought occurred to him.
当他想到这一点时，他更加痛恨汤姆了。
I was hiding behind a low bush, waiting for some animal to pass when this large stag appeared.
我躲在一个矮树林的后面，等着动物经过，这时这只巨大的雄鹿出现了。
When this happens, the parent birds usually won't care, other than to be a little more careful than normal.
当这种情况发生时，成鸟通常不会在意，只是会比平时更加小心一点。
When this worker has raised a crucial point in her project, she may show it to a classmate or co-worker just to get another opinion.
当这个员工在她的项目中提出了一个关键点时，她可能会向同学或同事展示它，只是为了得到另一个观点。
I wasn't surprised when this didn't make the news here in the United States—we're now the only wealthy country without such a policy.
当这条消息没有在美国成为新闻时，我并不感到惊讶——我们现在是唯一一个没有这样的政策的富裕国家。
When this water is used for agricultural irrigation, farmers risk absorbing disease-causing bacteria, as do consumers who eat the produce raw and unwashed.
当这种水用于农业灌溉时，农民有接触到致病细菌的风险，那些食用了未加工和未经清洗的农产品的消费者也会面临这种风险。
When this is impractical you can at least make sure that you have a drink of water and let the water through your teeth to force out any particles of food.
当你做不到这样的时候，你可以确保你至少有口水喝，让水通过你的牙齿，排出所有食物残渣。
It will never be known how and when this numeration ability developed, but it is certain that numeration was well developed by the time humans had formed even semi-permanent settlements.
我们永远也不会知道这种计算能力是何时、如何发展起来的，但可以肯定的是，在人类形成半永久定居点的时候，这种计数法已经发展得很好了。
The explosion lifted about 100 trillion tons of dust into the atmosphere, as can be determined by measuring the thickness of the sediment layer formed when this dust settled to the surface.
这次爆炸将大约100万亿吨的尘埃提升到大气中，这一数字可以通过测量这些尘埃降落到地表时所形成的沉积层的厚度来确定。
I came here by chance and was just watching what was going on, when this girl came up to me.
我碰巧来到这里，正在看热闹，这时一个女孩向我走来。
We are not sure when this pandemic will end.
我们不确定这场大流行病何时结束。
When this mixture cools, the result is of course glass.
混合物冷却后，其成果当然是玻璃了。
If you ask a group of parents when this happened, most will say "around twelve months of age".
如果你问一群父母这是什么时候发生的，大多数人会说“大约12个月大”。
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