It was only when the hull was hanging freely from the lifting frame, clear of the seabed and the suction effect of the surrounding mud, that the salvage operation progressed to the second stage.

只有当船体从升降架上自由悬挂，脱离海床和周围泥浆的吸力作用时，打捞工作才进入第二阶段。

youdao

However, many thousands of barrels of oil will now flow freely until the new cap is fitted, an operation that could take four to seven days.

然而在新的控油罩安装完毕之前，尚有成千上万桶石油还会肆意涌出，而该项工程需要四到七天才能完成。

youdao

The equipment adopts electronic control spraying and blowing system and can adjust pulse cycle and width freely. Its operation is flexible and convenient.

本设备采用电子控制喷吹系统，任意调节脉冲周期和宽度，操作灵活方便。

youdao