名词

1.可数名词： 回归线

2. the tropics 热带；热带地区

词形变化

形容词tropical

英语解释

of weather or climate; hot and humid as in the tropics

relating to or situated in or characteristic of the tropics (the region on either side of the equator)

either of two parallels of latitude about 23.5 degrees north and south of the equator representing the points farthest north and south at which the sun can shine directly overhead and constituting the boundaries of the Torrid Zone or tropics