The USPS used an elaborate system ofpneumatic tubes during the early 19th century, but London took anentirely different approach and built this scaled-down railroad systemto be used only for parcels.

19世纪初美国邮政使用了气动管精密系统，但伦敦使用了完全不同的方式，建立了这个小规模的铁路系统，只能用于包裹运输使用。

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To test how the system works, the team tried making two different kinds of pores - some that were uniformly sized tubes, others that had a narrow bottleneck at one point and then widened out.

测试这个系统的性能，该小组坐了两个不同的孔，一个是上下大小相同的管子，另一个是上小下大的。

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The head of the ox was designed with a complex system of tubes and stops so that the prisoner’s screams were converted into sounds like the bellowing of an infuriated bull.

牛头的部分是十分复杂的管道和弯道, 受刑人的尖叫会被转变为类似被激怒的公牛死后的声音.

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According to the Seattle Times, the fix also involves using a system of venting tubes that in case of an incident would channel any flammable vapours or liquids directly out of the plane, and continuous monitoring of the temperature and voltage of individual cells within the battery.

BBC: Dreamliner: Japan's ANA cancels more Boeing 787 flights

As HGS unearthed new proteins, he would mix them with various immune-system cells in test tubes to see what happened.

FORBES: Magazine Article

The stuff is put through a strainer to remove random debris, then sucked via tubes into a vacuum system that blends it with other polyurethane scraps recovered from car dashboards and shipping materials.

FORBES: Wipe Up