做科学实验时，一个人对仪器必须非常小心。
In doing scientific experiments, one must be more than careful with the instruments.
你必须小心使用薄荷当一个人怀孕，因为它是非常强。
You must be careful of using mint when you are pregnant, as it is very strong.
我有很多亲人在中国，我非常担心他们的健康。我想提醒每一个人买东西的时候要特别小心。
I have many relatives in China that I am very concerned about their health. I want to remind everybody to be very careful when you go shopping.
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