Upper plenum
[化] 顶盖
🧩 词语组成解析
upper
['ʌpə]
adj. 地位较高的;上面的;内地的;地表层的;
n. 鞋帮，靴面;兴奋剂;令人兴奋的经历;
n. 充实, 充满
🗣️ 情景例句
See, it works!
瞧， 真有效！
Time works wonders.
时间可以创造奇迹。
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。