On the ground of principle of virtual work, this paper put a new theoretical meth - od to solve question of balance by constrained equation.

本文在虚功原理的基础上，提出了一种利用约束方程求解平衡问题的新理论方法。

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So some constrained-routing mechanism must be taken to balance network load and improve transfer efficiency.

因此，需要采取一定的约束路由机制来平衡网络负载，提高传输效率。

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The success of such moves is much in doubt, especially if their balance sheet is constrained.

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Many of the best acreage positions have been established by upstart independent companies that were quick to acquire land, but that now are constrained by their relatively small balance sheets from efficiently developing it.

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