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① 翻译和含义解释： - "a half hour"：表示一个半小时的时间段。 - "half an hour"：表示半小时的时间段。 ② 语法详解： - "a half hour" 是由冠词 "a"（一个）与名词短语 "half hour"（半小 … · half的用法总结如下： 1、"half"作为名词：表示一半的数量或程度：half of the apples（一半的苹果）、half the size（一半的大小）；用来指代特定的时间段：half an … · 半高宽（Full-width at the half of the maximum, FWHM）计算推导在分析正态分布时，半高宽（FWHM）是一个常用指标，用来描述峰值两侧半高对应宽度。假设随机变量X遵 … a half hour和half an hour含义一样，都是指0.5小时。区别如下： 一、英语和美语表达不同 1、a half hour ，是美语表达。 2、half an hour 英语表达。 二、冠词不同 1、a half hour冠词为a，因 …
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