Levelness
水平度
🗣️ 情景例句
When does he arrive?
他什么时候到？
Nothing must be done hastily but killing of fleas.
除非消灭跳蚤，做事不必急躁。
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。