The candidates are already limbering up for the election campaign.各候选人已经在为竞选运动热身了.We start by doing limbering up exercises and then go on to do the aerobics.我们先做些柔软运动灵活四肢,再做有氧运动....
电离层是指含有带电物质的空间区域.The ionosphere is that region of space contatining electrically charged species.其上限由电离层的状态而决定.Its upper limit is determined by the conditions in the ionosphere.火箭和人造卫星能够到达电离层以上极远的地方.Rockets and artificia...