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回来的路上，阿美竟然碰到了妈妈和弟弟，原来在阿美买药的时候，妈妈已经带弟弟去了一趟医院。妈妈要阿美再去一趟药店，阿美只好第三次去药店，那么这次又是去干什么呢？ Listen Read Learn May: Here you are. How is Danny? Shirley: Better now. We are just back f

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Nowadays, it's less common to use placebos this way because of ethical concerns. 如今，通过安慰剂的这种方法已经不常见了，因为涉及到道德问题。 If it's possible to compare a new drug against an older version, 只要将新药

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