It reflects the joint force of nature and human evolution.
它反映了自然和人文进化的合力。
Using the variable argument PI control method, the force control of joint is studied.
采用变参数PI控制方法，对关节的力闭环控制进行了试验。
It was a joint operation of the navy and air force.
这是一次海军和空军的联合行动。
It was a joint operation of the navy and air force.
这是一次海军和空军的联合行动。
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