我一直没有真正理解这一点直到有一次遇到严重的大浆动态平衡问题。
I did not really understand this until I ran into some serious dynamic blade balance problems.
我一直都不知道他曾处于那么绝望的情形，直到有一次他无意讲出来了。
I had been unaware of his hopeless situation until once he revealed it by accident. Anyone else would have been least likely to stand the harsh pressure as he did.
她总是会放弃，并打电话给Mona，直到有一次，在一次没人认识她的大会上，她出现了支气管炎。
She always caved and called Mona, until she developed bronchitis at a conference where no one knew her.
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