Tetranucleotide
四核苷酸
🗣️ 情景例句
Ring? Ring?
戒指？ 戒指？
An old physician,and a young lawyer.
医生老的好，律师年轻的好。
A lot of cars entered for this race last year and there was a great deal of excitement just before it began.
去年有很多汽车参加了这项比赛。比赛开始之前，人们异常激动。