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 man upstairs with plastic barrels of mud, fallen after the empty bucket hook back cable hook, the child will control cable lever slowly back.

楼上的人接下胶桶的泥沙，倒下后将空胶桶钩回钢缆的钩子上，小孩又将控制钢缆的杠杆慢慢放回原处。

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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.

FORBES: Magazine Article