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 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...
对于大额的支票和汇款单要使用挂号邮寄。Use recorded delivery for large cheques or money orders.他让他妈妈用挂号邮件寄。He asked his mother to send it by registered mail.那位患者挂号时用了假名。The patient was registered under a false name....