Deuterium
n. 氘, 重氢\\n[化] 氘; 重氢
🗣️ 情景例句
Dear Mr. Lee.
亲爱的李先生。
Please excuse me.
不好意思，请让一下。
Wu dropped his stick! He stopped to get it and of course fell behind.
吴的接力棒掉地了！他停下捡棒，当然就落后了。