Diprotic
双质子的
🗣️ 情景例句
the autograph of somebody who may be famous someday.
将来有可能成名的人的亲笔签名。
Prosperity gains (or makes) friends, and adversity tries them.
顺境交朋友，逆境试真情。
A man was walking through a wood and he came across a woodcutter.
一个人正步行穿过一片树林，他遇见一个伐木工人。