noun · a person's proficiency or skill in swimming

他的水性很好，可以在江里游很久。

noun · aqueous or containing water as a primary solvent, typically referring to paints or inks

这种水性漆环保且没有异味。

noun · the nature or physical properties of a body of water, such as its depth and currents

在这片陌生水域游泳之前，必须先了解水性。