To train a rat, the experimenter placed it in an operant conditioning chamber: a small plastic box with a lever at one end.

为了训练小鼠，实验人员把它放在一个操作性条件反射室：一个一端置有操作杆的塑料箱。

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When a charged particle zips through the chamber, the vapour condenses into a trail of droplets showing the particle's path and, if the box is placed in a magnetic field, its electrical charge.

当一个带电粒子快速穿越云室时，水汽会凝结形成一串小液滴，这样便标识出了该粒子的路径；若将容器置于一个磁场中，还能知道粒子所带电荷的性质。

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Engine fittings series:Gear chamber, Cavaera cover, Sprocket rooms cover, Preheaterbase, Water pump Cover, Intake manifold, Pump box.

发动机配件类：齿轮室、气门室罩盖、 链轮室罩盖、预热器座、水泵泵盖、进气歧管、泵箱；

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The black-box nature of the Chamber makes deniability easier.

ECONOMIST: Corporate lobbying

The bones, discovered on Mersea Island in 1912, were in a green glass urn, stored in a box that was inside a brick chamber.

BBC: Mersea Island ancient bones to be examined

Beyond the ballot box, then, rears the spectre of a possible stalemate, with one side controlling the Chamber of Deputies and the other the Senate.

ECONOMIST: Italy's election