The air is rare at high altitudes.高处空气稀薄.Bottoming out near Heron Island, a manta ray can hit much higher altitudes too.可以在鹭鸶岛附近潜至最深处的鬼蝠魟,其实可以更上一层楼.The space shuttle can orbit at altitudes of up to 965 kilometers.这架航天飞机最...
At high altitudes it is difficult to breathe.在海拔高的地方会感到呼吸困难.The air is rare at high altitudes.高处空气稀薄.Of special interest is the photographic determination of altitudes of lunar formation.最有趣的是用照相来测定月面结构物的高度....
The approaches to the garrison have been heavily mined.通往驻防地的道路上地雷密布。Some of the world's supply of salt is mined as rock salt.世界上供应的盐有些是从开采岩盐得到的.The silver which was mined there was minted into coins.在那里开采的银子被用来铸成钱币...
Expound magnesium metallurgy with ferrosilicon process and calcium metallurgy with aluminothermic process by contracting technological conditions.通过工艺条件对比分析,阐明了硅热法炼镁与铝热法炼钙两者工艺过程、设备条件基本相同....