蝴蝶的英文怎么来的

　　例句：

　　The butterfly fluttered from flower to flower.

　　蝴蝶在花丛中飞来飞去。

　　It is a very pretty butterfly, with a 2 inch wing span.

　　它是一只非常漂亮的蝴蝶，翅膀张开有2英寸宽。

　　The caterpillar will eventually metamorphose into a butterfly.

　　毛毛虫最终将蜕变成一只蝴蝶。