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。
To train a rat, the experimenter placed it in an operant conditioning chamber: a small plastic box with a lever at one end.
以及一端系有集中质量的非均匀弹性杆振动问题。
The vibration of a nonuniform flexible rod connected to a concentrated mass is also solved.
自锁型气弹簧是一种可以在行程任一位置锁定的气弹簧。 在自锁型气弹簧的活塞杆端部有一个针阀打开这个针阀，则自锁型气弹簧可以象自由型气弹簧那样运行；
The piston rod self-locking type gas spring end there is a needle valve open the needle valve is self-locking type gas spring can run as the free type gas spring;
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