因为这后面有个equally long history
whereby 表示借此,1无法表达平行关系 2 历史是无法借此（借西瓜已经种植4000年）来推测出的,它要通过考证的,所以不能用whereby thumping them,
BTW：and whereby thumping这个是错的啊,答案是,and thumping
一道sat语法题watermelons have been cultivated for more than 4000
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