undercarriage

(also `landing-gear) n aircraft's landing wheels and theirsupports （飞行器的）起落架: raise/lower the undercarriage 收起[放下]起落架. =>illus at aircraft 见 aircraft 插图.

undeniable, undeniably, under, under arms, under control, under the charge of, under the heel of, under the order of, under way, under-, under-secretary, under-sexed, under-side, underachieve, underachiever, underact, underarm, underbelly, underbid, underbrush, undercharge, underclothes, undercoat, undercover, undercurrent, undercut, underdeveloped, underdog, underdone, underestimate, underexpose, underexposure, underfed, underfelt, underfloor, underfoot, undergarment, undergird, undergo, undergraduate,