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At present , china lacks such constraining mechanisms .

当前的中国缺乏有效的限制垄断机制。

But fixed supply will become a constraining factor on economic activity .

但在经济活动中固定的供应将会成为一个约束性的因素。

Constraining time encourages quality time .

限制时间刺激了更有效的时间。

Constraining national expenditure would make it easier to cap donations too .

限制全国性竞选开支，也会使限制捐款上限更容易。

And as so often in finance , constraining liquidity in one part of the system risks shifting trouble somewhere else .

限制该系统中某部分的流动性有可能把麻烦转移至其他部分，这种情形常常发生在金融机构。