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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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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With mainstream capnographs, the measuring chamber in the airway adaptor can become dirty or damaged, leading to erroneous end-tidal or inspired carbon dioxide values.

对于主流型二氧化碳分析仪，位于通气接头的测量盒可能会变脏或被损坏，导致错误的或吸入二氧化碳值。

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At the wedding itself, many couples hire small chamber groups to play classical music before and at the end of the ceremony.

VOA: special.2010.08.09

The president of U.S.Chamber of Commerce says his group is supporting the efforts of some U.S.lawmakers to end the trade embargo on Cuba.

VOA: standard.2009.05.06

An outline proposal for the extended flood defence scheme was due to be drawn up by the end of the year, Sheffield Chamber of Commerce confirmed.

BBC: Sheffield flood defence scheme to be extended

Senate Majority Leader Harry Reid of Nevada said last week the Finance Committee negotiators needed more time to complete their compromise agreement, while House Majority Leader Steny Hoyer of Maryland said Monday that a vote won't happen by the end of the week, when the chamber is scheduled to break until after Labor Day.

CNN: House health-care negotiations end night without a deal

He wants a slimmed-down single-chamber Congress, stronger parties, and an end to the scam which sees election-winners ceding their seats to alternates who also qualify for generous salaries and pensions.

ECONOMIST: Uribe's hour