They have had serious effects upon the biota of stream.
它們對(duì)河流中的生物群體產(chǎn)生嚴(yán)重影響.
辭典例句
The past decade has witnessed the discoveries of various important fossils from the Mesozoic Jehol Biota.
摘要最近十多年來,我國在熱河生物群各門類生物研究方面取得了一系列重要的發(fā)現(xiàn)和成果.
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