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 timer then opens the lower valve for a fixed period of time, permitting the - plastic powder to discharge from the intermediate chamber.

定时装置随后开启下面的夹管阀并持续一段固定的时间，让塑料粉末从中间罐腔中排出。

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But problems can occur because the softened thermosetting plastic can end up hardening while still in the heating chamber.

但是，可能会发生问题，因为软化热固性塑料可以结束了硬化，同时仍处于暖气厅。

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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

The outer layers are made of acrylic plastic and the vacuum chamber in the middle is divided into three or four watertight compartments stacked on top of one another.

ECONOMIST: Cataracts

The pride of completion includes plastic-fashioned laser cannons, escape pods, Darth Vader meditation chamber and a hologram of the evil Emperor.

FORBES: Magazine Article