flatten

vt.变平

flash-locks, flash-point, flashback, flashbulb, flasher, flashily, flashlight, flashy, flask, flat, flat racing, flat spin, flat-bottomed, flat-fish, flat-footed, flat-iron, flatcar, flatlet, flatly, flatness, flatter, flatterer, flattering, flatteringly, flattery, flatulence, flatulent, flaunt, flautist, flavor, flavour, flavour (US flavor), flavouring (US flavoring), flavourless (US flavorless), flaw, flawless, flawlessly, flax, flaxen, flay,