crab-louse

例句：

1. 1. They found the crab-louse infesting their house.
   他们发现房子里有蟹虱子。
2. 2. The crab-louse is a common pest in many coastal areas.
   蟹虱子是许多沿海地区常见的害虫。
3. 3. To control the crab-louse population, they sprayed the water with insecticide.
   为了控制蟹虱子的数量，他们用水喷洒了杀虫剂。