在表示半.的数量时,一般用half a...或half an...
例如：half a year(半年）,half an hour(半小时）,half a day(半天）.
在表示一个数量单位时,不定冠词在half之前,half与单位之间加连字符-.但在美国英语中,无论是表示数量还是单位都不加连字符.
例如：a half-apple / a half apple(半个苹果）.
half a million和a half million 有什么不同
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英语翻译：six-and-one-half-thousand-million dollars