首次在空中航行的飞行器是气球.The first vehicles to navigate the air were balloons.大型飞行器的驾驶员是航空学方面的专家.Pilots of large aircraft are masters of aviation.他设计了一种新式飞行器.He contrived a new machine for flying....
Their missile silos are below ground.他们的导弹发射井在地下.If we don't unload it soon, the grain will start rotting in the silos.如果我们不立刻把粮食卸下来，它们就会在筒仓里开始腐烂。We send the food and water down into the mine through silos.我们通过立井把食物...