METHOD:The use of antibiotics in hospitalized respiratory system infected childen was reviewed.
方法：回顾性调查我院呼吸系统感染住院患儿的抗生素使用情况。
These books also teach the remainder of the 220 highest-frequency words that childen have to learn.
这些书也教220频率最高的词的其余部分，孩子必须学会。
These books also teach the remainder of the 220 highest-frequency words that childen have to learn.
这些书也教220频率最高的词的其余部分，孩子必须学会。
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