tropic of Cancer

tropic-of-cancer的词性：
n.（名词）

1. The parallel of latitude 23⁼27&S{￠} north of the equator, the northern boundary of the Torrid Zone, and the most northerly latitude at which the sun can shine directly overhead.
北回归线，夏至线：即北纬23⁼27&S{￠}的纬线, 位于赤道以北，是热带地区的北边界，太阳垂直照射的最北端