求翻译：对于散料堆场，只有外界风速达到一定强度，该风力使料堆表面颗粒产生的向上迁移的动力足以克服颗粒自身重力和颗粒之间的摩擦力以及其他阻碍颗粒迁移的外力时，颗粒就离开堆垛表面而扬起，此时的风速就称为起动风速。是什么意思？

For bulk yard, only the outside wind speed reaches a certain intensity, the wind particles to the surface stockpile of power generated is sufficient to overcome the upward migration of particles and particle self-gravity, and friction between the particles impede the migration of other external forc

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Regarding bulk dump site, only then the outside wind speed achieved when sufficiently certain intensity, this wind power causes the material to pile which the superficial pellet to produce the upward migration power overcomes between pellet own gravity and the pellet friction force as well as other

For bulk material yard, only external wind speed reaches a certain intensity, the wind up the pile surface particle migration is dynamic enough to overcome the particle gravity and friction between particles and other obstacles when external forces of particle migration, particles leave the surface

For bulk material yard, only external wind speed reaches a certain intensity, the wind up the pile surface particle migration is dynamic enough to overcome the particle gravity and friction between particles and other obstacles when external forces of particle migration, particles leave the surface