As the joint surfaces suddenly separate, there is no more fluid available to fill the increasing joint volume, so a cavity is formed and that event is what is associated with the sound.

当关节接合处突然分开，液体无法流入不断增大的关节真空处，因此形成了一个气泡，这就是响声的来源。

youdao

No other available work provides the up-to-date and in-depth coverage of this series and this volume.

没有其他可得到的工作提供这系列和这卷的最新和详细的新闻报导。

youdao

As no figures are available for the volume of drugs being traded, the best way to measure it is to look at what is happening to drug prices north of the border.

ECONOMIST: Drug violence in Mexico