每天晚上都要到很晚才能睡着，我很无奈，我不知道怎么回事，未来是一个巨大的未知数。
Late every night to sleep, I am helpless, I do not know how happened, the future is a huge unknown.
就未来的天色转变而言，其一一个未知数就是不知道水轮回会发生若何的转变。
One of the unknowns concerning future climate change is what changes will occur in the water cycle.
对于那些不知道，谷歌duois搜索巨头的反应还是个未知数。
For those not in the know, Google Duois the search giant's response to FaceTime.
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