他做题太粗心了。
He is too careless when doing exercises.
careless; thoughtless
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.
他做题太粗心了。
He is too careless when doing exercises.
别这么粗心,再检查一遍。
Do not be so careless, check it one more time.