Sfm
abbr. surface feed per minute 表面/分鐘流量; surface feet per minute 每分鐘英尺表面線速度數(shù)，英尺/分表速
??? 情景例句
Are you all right?
你還好嗎？
The world is but a little place, after all.
有緣千里來相會。
How?
怎么做呢？