The test results and the main factors of influencing ash cutting, such as, particle velocity, property of ash cutting and particle size are discussed at length.

作者对试验结果及影响飞灰磨损的主要因素，如粒子速度、灰的磨损性能、粒度等进行了讨论。

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Mr Dockrell, from Ash, said the Canadian province of Saskatchewan clearly illustrated how the ban was effective in cutting smoking.

BBC: Smoking ban lessons from abroad