noun · vertical dimension, relative level, or musical pitch

这两棵树的高低差不多。

adjective, noun · referring to the physical state of being uneven or having variations in surface level

这条小路高低不平，很难走。

noun · finally or eventually after some time or effort

费了老大劲，高低把这事办成了。

noun · simply, just, or under any circumstances (expressing insistence or a stubborn negative)

我劝了半天，他高低不听。

noun · sense of what is appropriate or discreet, often used in the negative

他说话不知高低，没少得罪人。

noun · comparative quality, excellence, or level of skill

工人们正在测量地基的高低，确保地面的水平误差在规定范围内。