他体质较弱。
His constitution is weak.
(a person's) constitution; underlying physical condition; physical makeup; (of an organization, society etc) structural soundness
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.
他体质较弱。
His constitution is weak.
体质可以锻炼。
The constitution can be trained.