not able to be relied on; not known or definite
不可靠的;未知的;不确定的
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an uncertain future .前途未卜。
(of a person)not completely confident or sure of something
(人)不自信的;无把握的
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I was uncertain how to proceed .我没把握下一步该怎么做。
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in no uncertain terms clearly and forcefully 毫不含糊地she has already refused me ,in no uncertain terms . 她已经毫不含糊地拒绝了我