缩写
中文翻译：不特定
同义词：
['unknown', "unknown例句：1. The team's performance was unexpectedly good.（这个团队的表现出乎意料地好。）"]
例句：
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1. The team's performance was unexpectedly good.
这个团队的表现出乎意料地好。
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2.We are still trying to find out what happened.
我们仍然试图找出发生了什么。
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3.It is unknown how long the earthquake will last.
地震会持续多久还不清楚。