Quadrivalency
n. 四价
🗣️ 情景例句
Uh-oh. It's probably the hospital.
哎哟 ，可能是医院。
better early than late.
宁早勿迟。
One moement let me show you out, sir. Good day, sir, good day.
先生，请稍等一会我送您出去。再见，先生，再见。