These fires create convection funnels, and throw a lot of particles into the upper atmosphere.这些火焰造成了对流漏斗，把许多微粒抛向上层大气。Convection can be of two types: natural convection and forced convection.对流可分为两类, 即 自然对流和强制对流.Conducti...
My kids have been brown-bagging it this week.我几个孩子这个星期一直是自带午餐上学。Crystals from the centrifuge are dried and then conveyed to the storage silo or bagging equipment.离心分离出来的结晶经过干燥,然后输送到简仓或装袋设备.Qian Yi Jin pepper 28, the boss...