When you sit down with your family to eat a meal, have you ever wondered when and where people used chopsticks for the first time?
当你和家人坐下来吃饭时，你有没有想过人们第一次使用筷子是在什么时候、什么地方？
Tigers fight to death only when a tigress is defending her young, or when a tiger is guarding a tigress from the attentions of other males.
只有当母老虎在保护自己的幼崽时，或者当公虎在保护母老虎不受其他雄性动物的注意时，它们才会殊死搏斗。
When he was talking to a girl he could hardly speak, and when he did speak he talked gibberish.
跟女孩讲话时，他几乎说不出来，好不容易说出来了，又都是些胡言乱语。
When I was nine or ten someone explained to me that when you are grown up you have to work.
在我9岁或10岁的时候，有人跟我解释说，人长大之后必须工作。
It's healthy to eat when I'm hungry and to stop when I'm full.
我饿了就吃、饱了就停是有益健康的。
When I was a little boy, there was a time when I went to fish with my elder sister.
当我还是个小男孩的时候，有一段时间我和我姐姐去钓鱼。
Telling yourself to stop being anxious when you're feeling anxious is a bit like telling yourself to fall asleep when you have insomnia—it doesn't work.
当你感到焦虑时，告诉自己不要焦虑，这有点像当你失眠时，告诉自己要入睡一样——是行不通的。
Our phones are like cigarettes—something to do when we're anxious, bored or when our fingers need something to toy with.
我们的手机就像香烟，当我们感到焦虑、无聊或者手指想要摆弄些什么的时候，它就能派上用场。
The remaining 423 students merely cleaned their teeth when they went to bed and when they got up in the morning.
剩下的423名学生只在上床睡觉和早上起床的时候刷牙。
You have to be very alert when you are at your most vulnerable, especially when you are depressed or feeling isolated.
在你最容易受到伤害的时候，你必须非常警惕，尤其是当你感到孤独的时候。
When asked straightforwardly, people tend to lie or shade the truth when the subject is sex, money or employment.
当被直接问到涉及性、金钱或工作的话题时，人们往往会撒谎或掩盖真相。
When asked straightforwardly, people tend to lie or shade the truth when the subject is sex, money or employment.
当被直接问到涉及性、金钱或工作的话题时，人们往往会撒谎或掩盖真相。
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