The key point in making underwater concrete of drill hole grouting pile is that it requires high fluidity.

钻孔灌注桩水下混凝土配制的关键是要求流动性要好。

youdao

2 pullouts underwater + 2 full strokes on the surface + 2 more pullouts underwater ( 6 total strokes ) , per 25 . this drill forces you to get the most out of each pull.

试着每25米用2个水下长划臂加上水面的完整划臂，再加上两个水下长划臂总共6个划臂动作完成，这个练习能让你达到最大的划臂行程。

youdao

As in the standard underwater breaststroke kick drill, keep your eyes down and watch the tiles to make sure they don't come to a stop.

这是一个标准的水下蛙泳踢腿练习，因此你的眼睛要向下看，看着水底的瓷砖以确定你没有停止滑行。

youdao

The fact that oil companies now have to go a mile underwater and then drill another three miles below that in order to hit oil tells us something about the direction of the oil industry.

WHITEHOUSE: Deepwater BP Oil Spill: Presidential Press Conference

The burn-off is part of the effort to prevent the spread of oil from an underwater well that was broken open when the drill rig Deepwater Horizon blew up and sank last week.

CNN: Oil spill from rig explosion at 5,000 barrels a day

Companies can now drill 10, 000 feet to 11, 000 feet underwater with remarkable safety, compared with far riskier drilling at several hundred feet four decades ago.

FORBES: Magazine Article