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within the body
internal
Low levels of choline in the body can give rise to high blood pressure.
This diet claims to eliminate toxins from the body.

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Open the tool →体内 (tǐ nèi) means “in vivo, within the body, internal”.
体内 is pronounced tǐ nèi in Mandarin Chinese.
“in vivo” is 体内 (tǐ nèi) in Chinese.
This page has 2 example sentences using 体内, each with pinyin and an English translation.