Ribotide
n. 核糖酸\\n[化] 核苷酸; 核糖核苷酸
??? 情景例句
Yes, sir.
是的 ，先生。
Thank you, if it's not too much trouble.
謝謝了，如果不是太麻煩的話。
Imagine a pen attached to the weight in such a way that its point rests upon a piece of paper on the floor.
假定把一支筆拴在重物上，筆尖落在地板上的一張紙上，