- 投 verbto throwto throw; to fling; to toss something toward a target
- 石 nounstonerock; stone; (bound form) made of stone; rock-like
- 下 verbto put into put something into a container; to add ingredients into boiling water; to apply effort or use force; to cast a net
- 井 nounwelldeep hole dug in the ground to obtain water, oil, or gas; also describes things shaped like a well shaft such as a skylight or mine shaft