It is shown that the body of different materials may be grasped with a necessary minimum grasping force according to the weight of the body.

经理论分析和一系列试验证明，该装置能根据物体的重量控制机械手以最小而必需的力来抓取不同材料的物体。

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But if they have credible information of some risk to the public, officers can use powers of arrest and force - providing they use the minimum necessary in the circumstances.

BBC: Magazine