Normal concentration
[化] 规定浓度; 当量浓度
🧩 词语组成解析
🗣️ 情景例句
Well, Robbie was eight pounds two ounces,
嗯 ，Robbie生下来八磅二盎司，
It's about an hour.
大概要一个小时。
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。