Pfs
abbr. porous friction surface(d) 渗透摩擦面
🗣️ 情景例句
Sure.
当然。
The doctor advised me to get plenty of exercise.
医生建议我多锻练。
Ice is only as safe as the water from which it is made,
冰块只有当制造冰块的水安全时才是保险的，