他的睡眠很好。
His sleep is good.
sleep; to sleep; (computing) to enter sleep mode
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
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Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
他的睡眠很好。
His sleep is good.
他睡眠不好。
He does not sleep well.