求翻译：另一部分粉尘在重力作用下有向下运动沉降的趋势，但由于射流的的作用，使得空气微团发生冲撞和摩擦，改变了原来的运动趋势，造成粉尘漂浮在空中，难以沉降是什么意思？

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Another part of dust have the downward movement subsidence tendency under the action of gravity, but as a result of jet flow the function, enabled the air micelles to occur dashes and rubs, changed the original movement tendency, created the dust float in airborne, subsided with difficulty

Another part of the dust under the action of gravity downward trends in deposition, however, due to the role of Jet, air parcel occur collisions and friction, changing the original movement, causing dust floating in the air, it is difficult to settlement

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