不清楚的用法和样例：
例句
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我不喜欢服用那些药。因为那些药伤我的眼睛，使我看不清楚东西。
I don't like taking those drugs, they make my eyes go out of focus and I can't see clearly. -
最糟糕的是我都不清楚他们是否收到了我的支票。
The worst of it is that I can't even be sure if they received my cheque. -
咕哝低声地嘟哝或者不清楚地说话
A low grumble or indistinct utterance.
