It was a perfection of a valve that made the aqualung possible and put man back into the sea with all the freedom of a fish.

是阀的完善使研究水中呼吸器成为可能，并将人类送到海里，使其象鱼一样自由。

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Open the upper sea inlet valve and close the lower one.

打开高位海底阀，关闭低位海底阀。

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The precious jade set connects Milky Way, temple valve deep sea.

瑶台连云汉，宫阀深似海。

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Though a program displays panels showing all the critical processes of a real rig (fire and gas detectors, valve status, oil flow from the sea bed and so on), and then responds to the actions of the trainee by altering these displays appropriately, a human operator can intervene at any time if things seem to be going too smoothly.

ECONOMIST: Virtual reality