I derived an expression for the lever rule.
我获得了杠杆定律的表达式。
Reducing a rule to its principle says that, for the purpose at hand, the principle cannot be questioned or further derived unless you create a new rule.
通过将规则还原为原则，对于当前的用途，除非创建新规则，否则不能对原则进行质疑或进一步派生。
One of them is, I derived an expression for the lever rule.
其中之一是，我得到的杠杆定律的表达式。
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