Pfs
abbr. porous friction surface(d) 渗透摩擦面
🗣️ 情景例句
Did you forget something?
你是否忘了什么东西吗？
Nothing to be got without pains but poverty.
只有贫困可以不劳而获得。
Has it ever happened to you?
这种事情在你身上出现过吗？