他的话很空洞。
His words are empty.
空洞
cavity; empty; vacuous
Watch it being written
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
空
洞
Nice writing!
Build with these blocks
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
空
See it in sentences
空洞的承诺无用。
Empty promises are useless.