惊！美国蝴蝶数量25年暴跌20%？1分钟带你精听精读CNN级头条新闻！

Sentence 1

Butterflies are known for pollinating plants and for their sheer beauty, but the population in the United States has plummeted by nearly a fifth over the past quarter century.

蝴蝶以其传粉作用和纯粹的美丽而闻名，但过去25年间，美国蝴蝶数量骤降了近五分之一。

Sentence 2

Mike Armstrong on the reasons why and the need for more protection.

迈克·阿姆斯特朗报道了原因以及加强保护的必要性。