Tetrasaccharide
四糖
🗣️ 情景例句
Oh, let me think for a minute.
哦，让我想一下。
which direction is it to the theatre?
它哪个方向对剧院？
Mars has an extraordinary fascination for would-be voyagers.
火星对未来的星际旅客来说有着特殊的魅力。