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.

• 科学家们平均每年发现大约7,000到10,000种新的昆虫一一他们认为还有100万至10，000万种有待发现。