单词	gastight
释义	gastight adjective gas·​tight ˈgas-ˈtīt  : impervious to gas gastightness noun Word History First Known Use 1831, in the meaning defined above
随便看	bacilluses Baciroa baciroas bacitracin bacitracins back back (up or away) back (up) back action back along back and fill back answer back arrow back away back bacon back beam back bond back bulb back burner back button back catalog back catalogue back center back channel back choir

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