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....
I bought some salami from the delicatessen.我在熟食店买了一些意大利香肠.Delicatessen usually require little preparation for serving.熟食一般不需另加烹调便可食用.The delicatessen closes at nine o'clock.熟食店9时关门....