noun · plain or flatland, frequently used in place names in Southwest China

这里的坝子非常适合耕种。

noun · a sandbar or shoal in a river or body of water

枯水季节，河中露出了大片的沙坝。

noun · a barrier constructed across a river or stream to hold back water and raise its level

这座大坝可以用来水力发电。