1. Regularly flowing rivers and streams that originate within arid lands are known as "endogenous". 起源于干旱地区的流动性河流和溪流通常被称为“内源河流”。
2. Endogenous rivers often do not reach the sea but drain into inland basins, where the water evaporates or is lost in the ground. 内源河流通常不会流入大海，而是流入内陆盆地；在那里，水会蒸发或流失到地下。
3. The clock oscillates at its own endogenous, or internal, period. 生物钟以自己的内在周期运作。
4. Endogenous angiogenesis inhibitors act as tumor suppressor proteins. 内源性血管生成抑制剂可作为一种抑癌蛋白。
5. Exogenous variables can include lagged values of endogenous variables. 外生变量可以包括内生变量的后滞值。
