树枝断裂时发出沉闷的嘎吱声。

The branch made a ___crunching sound when it snapped.

那个大个子威胁说如果他不退开就要狠狠揍他一顿。

The big guy threatened to ___clobber him if he didn't back off.

远处传来炮弹沉闷的爆炸声。

The artillery shells ___crashed in the distance with a dull thud.