I step off the barge and creep gingerly around the inner-tube as it bobs in the green-blue water.

从游艇上下楼之后，我小心翼翼的在内管周围转了一圈，当时正好有气泡从蓝绿色的海水中挣脱出来。

youdao

Turn the remnant of sodium hydroxide in the tube into water, and you'll find the solution turns red litmus blue.

把管内的氢氧化钠残液倒入水中，你就会发现：溶液会使红色石蕊试纸变蓝。

youdao

Will have no water steel (sulfuric acid) with white powder into the air pressure of the oil tube, such as copper sulphate from white to blue, it can also prove oil there is water there.

将无水硫酸钢(白色粉末)放进装有空压机油的试管中，如硫酸铜由白色变为蓝色，这也能证明油中有水分存在。

youdao

She wore a blue hairnet, had a tube in her throat, and lay under a white blanket, appearing alert, the Associated Press reported.

BBC: New York nanny Yoselyn Ortega denies murder charges

Now if only we could find a big-blue-ox-sized inner tube...

BBC: Daily deal: Legendary family waterpark getaway