Polyprotonic acid
[化] 多元酸
🧩 词语组成解析
🗣️ 情景例句
I have approximately three-year experience using a computer.
我有大约三年操作电脑的经验。
Hello. I wish to speak to Mr.Chen?
喂，我想和陈先生讲话。
who produced it with a flourish and pointed out a microscopic 'o' beside the time of the arrival of the train at his station;
站长拿着时刻表一挥手，指着那趟列车到站时刻旁边一个很小的圆圈标记。