Since an argument (that is convincing) (only if it is precise) loses all its force {if the assumptions (which it is based) are slightly changed}, 如果一个具有说服力的论断的假定条件有稍微变化的话,那么这个论断就会失去立足点
你给的句子很奇怪!——没有主句?? 从句句子成分划分如下 【Since (an argument 原因状语从句主语)(that is convincing 定语从句,argument)(only if it is precise条件状语从句) (loses原因状语从句谓语 )(all its force宾语)原因状语从句】【 if the assumptions (which it...