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因為arm的首字母a是元音,例如:
1、He had had an arm amputated and relied on her to take down his books from dictation.他的一隻胳膊截掉了,只能口授書的內容讓她來記錄。
2、He has lost the use of an arm.他的一隻胳膊殘廢了。
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