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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The optimum programme can be used to design four-connecting lever pneumatic roof-window mechanism of all kinds of multi-span plastic greenhouses by changing load and structure parameters.

通过改变载荷参数和结构参数，优化模型可用于其它塑料温室的气动四连杆天窗机构的设计。

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The utility model relates to a plastic casing type circuit breaker. An operating mechanism comprises a handle, a lever, and a connecting rod.

一种塑料外壳式断路器，其操作机构包括手柄、杠杆及连杆。

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Jutting conspicuously out straight into the middle of the net, is a gray plastic lever that actually registers when you sink a shot.

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Insert a foil pack of powdered insulin into a slot, prime the pump with a lever and push a trigger that releases the cloud of insulin into a clear plastic chamber.

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