经纬线用途十分广泛 ,如用来确定位置、指示方向、计算时差、认识气候等。但经纬线并没有刻在地壳上 ,而是看不见 ,摸不着的无数条虚线。怎么不打上记号呢 ?因为它们太多太长。不过 ,我们可以在一些重要的经纬线如赤道、本初子午线 ,南北回归线、南北极圈等通过的条件较好的地 The latitude and longitude lines are used in a wide range of ways, such as determining locations, indicating directions, calculating time differences, and understanding climate. However, the latitude and longitude lines are not engraved on the earth’s crust but are invisible and intangible. Why not mark them? Because they are too long. However, we can pass in some important latitude and longitude lines such as the equator, the Prime Meridian, the Tropic of the South, the North and South Tropics, and the North and South Arctic.