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preventing them from getting pregnant.从而避免怀孕
prevent from阻止； 防止
I was prevented from going by urgent business.
我因急事不能去。
I was prevented from going by urgent business.
我因急事不能去。
but women soon cottoned on to its real potential.不过女人们很快发现了它的真实作用
cotton on开始理解
He didn't seem to cotton on to me then.
当时他似乎并不喜欢我。
I don't cotton on to what you are saying.
我不明白你在说什么。
