wormcast

• 名词，指蚯蚓或沙蚕等穴居环节动物排出的圆柱形泥土或沉积物，也指其留下的化石痕迹。

A noun referring to a cylindrical mass of soil or sediment voided by a burrowing earthworm or lugworm, or a fossil trail left by a worm.

1. Earthworm excrementC1formal

   A small, coiled or cylindrical pile of soil that is excreted by an earthworm after it has passed through its body.

   蚯蚓粪

   • The garden soil was covered in small wormcasts, indicating healthy earthworm activity.
   • Wormcasts are a sign of fertile soil.
   • He carefully removed the wormcasts from the lawn before mowing.

2. Fossilized worm trailC2formal

   A fossilized trace or burrow left by a worm in ancient sediment.

   虫迹化石

   • The geologist identified a wormcast in the rock formation.
   • Fossilized wormcasts provide clues about ancient environments.
   • The museum displayed a slab of sandstone with clear wormcasts.