半厚前翅

例句：

1. 1. The butterfly's wings are made up of two pairs of forewings and two pairs of hindwings.
   蝴蝶的翅膀由两对前翅和两对后翅组成。
2. 2. The caterpillar has a forewing that can be used to fly when it grows into anadult moth.
   毛毛虫在变成蛾之前有一个可以飞行的前翅。
3. 3.The scientist discovered a new species of butterfly with a unique pattern on its forewings.
   科学家发现了一种具有独特图案的前翅的新蝶类。