could not be 是过去式,所以说如果前面的句子是过去时的话,就要相应地用could
而这二者相比较起来呢,could的语气和程度相对会比can弱一些的哈
希望有什么问题可以再提出来的哈,我们继续讨论的哈!
In the absence of friction,belts could not be used in convey
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