a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity
例句
用作名词 (n.)
The ciliated funnel-shaped inner opening of a nephridium into the coelom in some invertebrates and lower vertebrates. 肾孔,肾口一些无脊椎动物和低等椎动物体内通向体腔的肾管纤毛,漏斗形,内部开口。