Unstuousness
油性, 润滑性
🗣️ 情景例句
There are four of us including my parents, a younger sister and me.
有四口人，父母亲、妹妹和我。
Slowly, mountains are worn away by the wind.
山体逐渐被风化了。
A girl came in and put an envelope on his desk.
一个姑娘走了进来，把一个信封放在了他桌上。