For many, their long-awaited homecoming was a bitter disappointment.对许多人来说，他们期盼已久的还乡之行却令他们大失所望。She bore the homecoming queen tiara to school.她戴着返校节最漂亮女生的皇冠到学校.Every facility was laid on to ease their homecoming.动用了一切设施以缓...
这些火焰造成了对流漏斗，把许多微粒抛向上层大气。These fires create convection funnels, and throw a lot of particles into the upper atmosphere.对流可分为两类, 即 自然对流和强制对流.Convection can be of two types: natural convection and forced convection.散发汗水的一种方...