一个难句的翻译 By this weekend the ice edge lay 128 kilometers at sea,but 40 years ago,it was 64 kilometers out. 这个句子如何翻译，谢谢！

问题描述

By this weekend the ice edge lay 128 kilometers at sea,but 40 years ago,it was 64 kilometers out. 这个句子如何翻译，谢谢！

老师答疑

刘老师：

By this weekend the ice edge lay 128 kilometers at sea, but 40 years ago, it was 64 kilometers out.

【翻译】到本周末的时候，海上冰的边缘周长是128公里，但40年前它是64公里。