body fluid

body-fluid的词性：
n.（名词）

1. A natural bodily fluid or secretion of fluid such as blood, semen, or saliva.
体液：人体自然的液体或分泌物，如血液、精液、唾液

2. Total body water, contained principally in blood plasma and in intracellular and interstitial fluids.
身体水分：身体所有的水分，主要含在血液的血浆、细胞和组织间隙的液体中