A practical closed-type test rig is here described for testing the tractor gear transmission, A new arrangement was developed to improve the structure of the loading gear box with odd number gears.

本文介绍了一种由浙江农业大学提出的拖拉机齿轮传动系统闭式试验台的新布置方案，这种布置方式解决了奇数齿轮加载齿轮箱结构上的困难。

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Waterproof: for PEVA rubber material closed type air bubble structure, each of the gas chamber in close condition.

防水：材质为PEVA橡塑密闭型气泡结构，每个气室处于封闭状态。

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Worse still, some entire industries remain closed-off to this type of cross-sector innovation and this, partnered with constrictive supply chains, is stifling technological progress.

BBC: Business

Initially open with glass walls, the master-bedroom suite can be closed off from the rest of the home with a type of glass that turns from clear to opaque at the flip of a switch.

WSJ: Modern Homes: A Bachelor Reboots

It's a type of security that has been around since Congress created a new class of closed-end funds in 1980 that allows individuals to tap into private-equity deals.

FORBES: Nothing Ventured