Step 3: Use a pencil to make a hole into both sides of the tube.

第三步：用铅笔在试管的两边都戳一个洞。

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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。

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And it determines the specific design step of the separation device of the expansion tube.

确定了膨胀管分离装置具体的设计步序。

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While the London Underground has been made more accessible in recent years (more than 60 stations out of 270 are now step-less between the street and the platforms), many Tube stations still present challenges for the disabled due to gaps between the platform and the carriage door.

BBC: London for disabled visitors

Improvements to the Tube station include increased capacity, a bigger ticket hall, refurbished platforms and step-free access.

BBC: Blackfriars Tube station reopens after three years