体质 tǐzhì constitution
(a person's) constitution; underlying physical condition; physical makeup; (of an organization, society etc) structural soundness
How to remember 体质: 体 body + 质 essence = constitution.
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How it is used
- One's physical constitution / bodily makeup - 他体质弱,容易感冒 (tā tǐzhì ruò, róngyì gǎnmào) he has a weak constitution and catches colds easily.
- About innate physical health/robustness; 增强体质 (strengthen the body), 过敏体质 (allergic constitution).
- Also extends to structural soundness of organizations, but the body sense dominates. Contrast 体格 (tǐgé, physique/build).