Granellarium
[动]钡粒管系
🗣️ 情景例句
and how hard it is
他还说这件事很难
What year is this?
今年是哪一年？
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。