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peak的用法Thepriceoflocallygrownapplesvariousfromapeakof$4.5perkiloinsummertoalowof$2.25inwinter,andtheyareavailableayearround.这句话里的apeakof为什么不能用apeakat?peak后面的介词怎么用?^

题目详情
peak 的用法
The price of locally grown apples various from a peak of $4.5 per kilo in summer to a low of $2.25 in winter,and they are available a year round.这句话里的a peak of 为什么不能用a peak at?peak 后面的介词怎么用?^
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答案和解析
注意,这里的peak和low表示最高值和最低值,是名词.
而后面加上价格,则of $4.5 per kilo属于介宾短语修饰名词.
The pearl peak is the highest peak of the world.