介壳虫

例句：

1. 1. The beetle is a common insect pest that can damage crops.
   这个甲虫是常见的害虫，可以损害农作物。
2. 2. The larvae of the butterfly are tiny and live inside the chrysalis.
   蝴蝶的幼虫很小，生活在蛹中。
3. 3. Insects play an important role in maintaining the balance of nature.
   昆虫在维持自然界平衡中起着重要作用。