过安慰

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3.

Almost half of the two hundred thirty-one doctors who answered said they had used placebos with patients at some time.

给予回答的 231 位医生中有一半说他们曾经给病人用过安慰剂。

5.

Of those who had ordered placebos for patients , more than half had done so within the past year .

在给病人开过安慰剂的医生中，多于一半是在过去的半年之内。