经度差因为向西的运动而产生的两个位置之间的经度上的差别 The difference in longitude between two positions as a result of a movement to the west.
用来代表衡量单位用来代表某一测量单位，如经度或纬度上的英尺或分 One used to represent a unit of measurement, such as feet or minutes in latitude and longitude.
没有一件事情比得上有朋在远方更使这地球显得如此广大的了；他们构成纬度，也构成经度。 Nothing makes the earth seem so spacious as to have friends at a distance; they make latitudes and longitudes.
