缩写
中文翻译：未定
同义词：
['unknown', 'uncertain', 'undetermined']
例句：
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1. We don't know for sure what happened to the lost treasure.
我们不确定丢失的宝藏发生了什么。
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2. The outcome of the election is still uncertain.
选举的结果仍然不确定。
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3. The weather forecast is very uncertain at this time of year.
这个季节，天气预报非常不确定。