我夜里经常失眠。
I often suffer unaccountable headaches.
我经常莫名其妙头痛。
I often suffer from unaccountable headaches.
我经常莫名其妙地头痛。
After flying across time zones people often suffer from jet lag.
经过跨越时区的飞行后，人们常常会有时差反应。
For people who often suffer from insomnia, it is a very painful thing.
对于经常失眠的人来说，是一件非常痛苦的事情。
For people who often suffer from insomnia, it is a very painful thing.
对于经常失眠的人来说，是一件非常痛苦的事情。
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