中文谷unknown quantity造句怎么写
- 造句
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Additionally, an unknown quantity of methane in the form of hydrates (or clathrates) lies trapped beneath the polar sea floors.
The Frenchman was an unknown quantity when he arrived in north London back in 1996.
Woodstock for them is only a picture in their textbooks, the Chicago Seven (or was it Eight?) are an unknown quantity.
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