By the time summer was gone, the ice was down to about 7.2m square kilometres.

而当那年夏季结束时，冰层减至到约720万平方公里。

youdao

By the time summer was gone, the ice was down to about 7.2m square kilometres.

而当那年夏季结束时，冰层减至到约720万平方公里。

youdao