Wei_Kao 发表于 2017-3-3 18:52
In the past several years, astronomers have detected more than 80 massive planets, most of them at l ...
Wei_Kao 发表于 2017-3-3 19:06
如果您說的"等同于是不存在"是指"省略後不影響原意",我的答案會是YES
欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |