Polar number
[医] 极性数
🧩 词语组成解析
🗣️ 情景例句
This is the big moment.
这可是关键时刻。
How often do you eat out?
你隔多久在外面吃一次饭？
A long time ago, one of his ancestors who lived in Africa went into the forest to cut down a tree to make a drum.
很久以前，他那生活在非洲的祖先中有一人走进森林去砍树来做鼓。