单词	locknut
释义	locknut noun lock·​nut ˈläk-ˌnət  1 : a nut screwed down hard on another to prevent it from slacking back 2 : a nut so constructed that it locks itself when screwed tight against another part Word History First Known Use 1855, in the meaning defined at sense 1
随便看	the tube the turf the turn of the century the Twelve the twist the ukraine the ultimate in the ultrarich the undead the underground the underneath the underprivileged the undersigned the understatement of the year the underworld the unemployed the unexpected the uninitiated the uninsured the union the Union Jack the United Nations the universe the unknown the unthinkable

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