Tetranucleotide
四核苷酸
🗣️ 情景例句
Only a five percent discount? How about twenty percent?
只打九五折？八折怎么样？
How long does it take for a letter to get to California ?
一封信到加利福尼亚要花多长时间？
Oh,there's someone at the door.
噢，门口有人！