Iec
[化] 离子交换色谱法
🗣️ 情景例句
It's a privilege to know you.
认识您是我的荣幸。
Happy landing.
祝您早安 注：是送行者向上飞机的人说的告别语。
and comforted by the thought of the help he was bringing to his friend,
想到能对朋友有所帮助，他感到欣慰，