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1 jupiter is flattened at the poles,with its polar diameter

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1 jupiter is flattened at the poles,with its polar diameter being 82.900 miles, and the equatorial
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jupiter is flattened at the poles,with its polar diameter being 82.900 miles, and the equatorial diameter 88.700 miles. 5081
这句话有3个问题.第一:jupiter is flattened 中是系表结构还是被动?第二:with its polar diameter being 82.900 miles这个表语中

为什么是being不是is或be.第三 and the equatorial diameter 88.700 miles.这个并列表语中diameter 88.700 miles为什么没有being或是is
Jupiter is flattened at the poles,with its polar diameter being 82.900 miles,and the equatorial diameter 88.700 miles.
第一:jupiter is flattened 是系表结构,说明木星在两个地极呈现出来的是平坦的状态.如果是被动语态,表示的则是有人在两个地极把木星弄平了.
第二:with its polar diameter being 82.900 miles 是独立主格结构“with + 名词主格 + 分词短语”,在句子中作伴随状语.
第三 and the equatorial diameter 88.700 miles = with the equatorial diameter being 88.700 miles,它与 its polar diameter being 82.900 mile 都是介词 with 的宾语,都属于独立主格结构,而不是并列表语中;所以没有 being,是因为为了避免与第一个并列结构中 being 的重复而被省略.
翻译:木星在两个地极处变平,其极地直径是 82.900 英里,而其赤道直径是 82.900 英里.