The antarctic circle is the boundary of this region of lightness . 南极圈就是这一明亮地带的边界。
2.
Penguins arrive from the antarctic circle on ice floes that melt in the vicinity of brazil ' s shore and the birds wash up on rio beaches every winter 这些企鹅随着南极圈的浮冰漂到巴西海岸附近。每年冬季，它们都在里约热内卢的海滩边玩水，许多企鹅因此被送往当地的动物园。
