When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it.
当你知道一件事,说你知道它;当你不知道一件事,容许你说不知道它。
This is indeed a very puzzling thing, I do not know why.
这确实是很令人费解的一件事,我也不知道这是为什么。
They do not know extravagance is a bad thing.
他们不知道奢侈是一件坏事。
The most painful thing is, you love a person, but do not have the courage to let him know how you feel.
最痛苦的事情就是,你那么爱一个人,却没有勇气让他知道你的感受。
They do not know extraudio-videoagance is a some riskous thing.
他们不知道奢侈是一件好事。
They do not know extravagance is a bad thing.
因为早晨是我们从事学业的大好时间。
They do not know extravagance is a bad thing.
因为早晨是我们从事学业的大好时间。
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