1(of an organization, society etc) structural soundness
2(a person's) constitution; underlying physical condition; physical makeup
Example
tā她què shí确实nián qīng年轻mào貌měi美，dàn但tā她tǐ zhì体质jiāo娇ruò弱。
她确实年轻貌美，但她体质娇弱。
Indeed she is young and beautiful, but she is in delicate health.