大部分微量元素，包括锰和砷，通过自然过程中的岩石风化作用进入水体。
Most trace elements, including manganese and arsenic, get into the water through the natural process of rock weathering.
当驾驶员踩下制动踏板时，制动液由于主缸的作用进入轮缸，推动两个活塞向外侧移动。
When brake pedal is pushed by the driver, brake fluid is forced into the brake cylinder by the action at the master cylinder, and the two pistons are forced outward.
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。
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.
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