knee frequency

例句：

1. 1.The knee frequency of the bone is measured in hertz (Hz).
   骨的膝盖频率以赫兹为单位测量。
2. 2.The knee frequency of the bone is measured in hertz (Hz).
   骨的膝盖频率以赫兹为单位测量。
3. 3. The knee frequency of the bone is measured in hertz (Hz).
   骨的膝盖频率以赫兹为单位测量。