His m-------- is very poor.He has read the text many times b

His【memory记忆】is very poor。He has read the text many times but he still can't remember it。Please read the 【instructions说明书 （必须用复数）】carefully before you take the medicine。祝开心。 再问： 为什么必须用复数？ 再答： 你查查词典就知道了，可以看作固定用法。 或者通俗地理解为：说明一般都是分为几条的。 词典上的例句：Read the instructions on the bottle before you take the medicine。