Acanthaster

例句：

1. 1.The aphid is the smallest insect on earth.
   蚜虫是地球上最小的昆虫。
2. 2.The aphid is responsible for damaging crops.
   蚜虫负责损害农作物。
3. 3. The aphid is a common pest that can damage plants.
   蚜虫是一种常见的害虫，可以损害植物。