体 + 内
体 (tǐ) is a noun meaning "body." It often appears in compounds such as 身体 (body), 体内 (inside the body), and 体力 (physical strength). On its own or in 体内, it refers to the physical self or the interior of one's body.
这种药可以帮助排出体内的毒素。
Zhè zhǒng yào kěyǐ bāngzhù páichū tǐnèi de dúsù.
This medicine can help expel toxins from the body.
长时间坐着对身体不好。
Cháng shíjiān zuòzhe duì shēntǐ bù hǎo.
Sitting for a long time is bad for your health.
运动能让体内的血液循环更顺畅。
Yùndòng néng ràng tǐnèi de xuèyè xúnhuán gèng shùnchàng.
Exercise can make the blood circulation in the body smoother.