2) Scientists discover approximately 7,000 to 10,000 new insect species every year on average and they believe that there are between 1 million and. 1 00 million species as yet unfound.

　
英 美
  • 科學(xué)家們平均每年發(fā)現大約7,000到10,000種新的昆蟲(chóng)一一他們認為還有100萬(wàn)至10，000萬(wàn)種有待發(fā)現。
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