He assured us that, no matter how hard we studied, all of these chemical equations would vanish from our memory.
他向我们保证,无论我们怎么用功,一切有机化学方程序都会从我们的记忆中消失殆尽。
If you want to make sure that all of your hard-earned money doesn't vanish, you'll need to take steps to protect it.
想确保所有辛苦挣来的钱不会消失,你需要采取措施加以保护。
It is hard to pin down what has been causing honeybees to vanish.
很难确定是什么原因使蜜蜂突然消失。
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