墙上留下了痕迹。
Traces were left on the wall.
vestige; mark; trace
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
Nice writing!
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
墙上留下了痕迹。
Traces were left on the wall.
他没有留下任何痕迹。
He left no trace at all.