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。

youdao

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。

youdao

Chris Hall, of the Rail Accident Investigation Board, said that Mr Lund would have had "no reason to believe" the train would change direction, which was most likely caused by the driver forgetting to lock the reverse lever.

BBC: North Yorkshire Moors Railway death: Family to sue