他看到这一幕的时候惊讶得下巴都掉了。

His ___jaw dropped in shock when he saw the scene.

他打哈欠时下巴发出咔哒声。

His ___jaw clicked when he yawned.

别跟我喋喋不休了，我还有工作要做。

Stop ___jawing at me, I have work to do.

钳子的夹口需要定期润滑以防止生锈。

The ___jaw of the pliers needs regular lubrication to prevent rust.