The word is derived form the Latin contractum, meaning drawn together.

合同一词源于拉丁语, 意思为共同努力.

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This class can only be instantiated in a derived form.

该类只能在派生窗体中实例化.

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There is no ignition derived form high voltage discharge that the neon lamp has.

可靠性高、可避免霓虹灯管高压放电打火的缺点.

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