没有药是对人没有伤害的,这里的意思是指正常情况下(即从临床试验起)还没有副作用,但是将来的情况没有谁能够保证;所以强调的是过去和现在;如果只用has no effect 语义就变成涵盖所有情况,当然不通的
this medicine has had no effect on the patient为什么要加 had,has
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