earthworm

That chick pecks out an earthworm from the earth.

那只小鸡从土里啄出一条蚯蚓。

The research made a use of the earthworm with a competition of natural fertilizer to study the influence of the two treatments to the ammonia yield in livestock excrement.

该试验利用蚯蚓生物处理方法，同自然堆肥作对比试验，研究了两种处理对畜禽粪便氨气产量的影响。