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。
The ability of sport and restore enginery has effect on improving of the lever of train and achieving of completion .
人体的运动能力和运动后疲劳的消除与机能的恢复，影响着训练和运动水平的提高与比赛成绩。
The ability of sport and restore enginery has effect on improving of the lever of train and achieving of completion .
人体的运动能力和运动后疲劳的消除与机能的恢复，影响着训练和运动水平的提高与比赛成绩。
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