snail

A garden snail moves very slowly and leaves a trail of slime behind it.

(Chinese) 花园里的蜗牛爬得非常慢，并在身后留下一道粘液。

The project is moving at a snail's pace because we are waiting for approval.

(Chinese) 由于我们在等待批准，项目的进展速度慢如蜗牛。