Covalence
n. 共用电子对数, 共价\\n[化] 共价
🗣️ 情景例句
Nancy, would you like to come over the day after tomorrow?
南西，你后天要不要到我家来？
Every medal has its reverse.
事物都有它的反面。
Thank you .It was very nice of you to help me.
谢谢你帮我，你真好。