guard-rail

n protective rail, eg to prevent people falling off a staircase or to separate them from dangerous traffic 护栏.

gruffness, grumble, grumbler, grummet, grumpily, grumpiness, grumpy, grunt, gruyere, gryphon, GT, Guam, guano, guarantee, guarantee against, guarantor, guaranty, guard, guard against, guard's van, guarded, guardhouse, guardian, guardian angel, guardianship, guardroom, guardsman, Guatemala, guava, gubernatorial, gudgeon, guelder rose, guerrilla, guerrilla (also guerilla), guess, guesser, guesstimate, guesswork, guest, guest-house,