Kalistrontite
n. [矿]硫酸锶钾
🗣️ 情景例句
Did any of your previous positions require typing?
你以前的职务中有没有需要打字的？
Who rang the bell a while ago?
刚才谁在按门铃？
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。