Even a modest force, if sustained over a long time, would do.
如果它持续很长的时间的话，即使风力不大也可以做到。
The upgrade would be larger if today’s growth rate were sustained.
如果今天的成长率持续，上升还会继续。
This mode of operation can't be sustained if it's all free.
如果一直免费，这种运作模式是不能够持续的。
This mode of operation can't be sustained if it's all free.
如果一直免费，这种运作模式是不能够持续的。
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