we know this area,two hundred years ago,was a lake__two-thirds of the size at presenttwo-thirds its present size要说为什么

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we know this area,two hundred years ago,was a lake__two-thirds of the size at presenttwo-thirds its present size要说为什么
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we know this area,two hundred years ago,was a lake__two-thirds of the size at presenttwo-thirds its present size要说为什么
we know this area,two hundred years ago,was a lake__
two-thirds of the size at present
two-thirds its present size
要说为什么

we know this area,two hundred years ago,was a lake__two-thirds of the size at presenttwo-thirds its present size要说为什么
选2
two-thirds its present size 修饰lake~
说明是这个湖现在的尺寸只有它原本its的2/3~