You can do this at any stage in the concentration, although it's most effective when the breath is still.
你可以在定的任何阶段这样做，不过在气寂止时最有效。
During the dust emission stage， the dust concentration rose sharply due to the mechanical and thermal turbulent mixing.
起沙阶段，动力和热力湍流混合使得沙尘浓度迅速升高
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