The only thing it cannot do is call the put method, and this is because it cannot verify the safety of such an operation without knowing the type parameter t for this Box instance.

它惟一不能做的事是调用put方法，这是因为在不知道该Box实例的类型参数t的情况下它不能检验这个操作的安全性。

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With the limitations of the maximal bearable bending moment and the positive lifting force, the controlling parameter curves of span and lifting Angle are then acquired to guide the safety operation.

以长桩结构能够承受的最大弯矩和吊点力不为负值作为限制条件，得出安全作业跨距和倾角参数控制曲线。

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