It is impossible to be sure about the value of land.土地的价值是无法确定的。You can be sure about their interest in it.你可以肯定他们对引很感兴趣....

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be sure about的音标：be sure about的英式发音音标为：[bi: ʃuə ə'baut]be sure about的美式发音音标为：[bi ʃʊr ə'baʊt]...