Border crossing agreement
[法] 边境协定
🧩 词语组成解析
🗣️ 情景例句
I don't know what you are driving at.
我不知道你到底想说什么。
All are not merry that dance lightly.
表面高兴的，未必都快乐。
But here we come up against the most difficult of all obstacles to contact with people on other planets ----the astronomical distances which separate us.
然而，在和外星人联系中我们遇到的最大困难是分隔我们的天文距离。