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n.反馈，反应

feckless, fecklessly, fecklessness, fecund, fecundity, Fed, fed up, federal, federate, federation, fee, feeble, feeble-minded, feebleness, feebly, feed, feed in, feed on, feed up, feed with, feedbag, feeder, feeding-bottle, feel, feel about, feel amused at, feel bitter at, feel envy at, feel guilty about, feel like, feel one's way, feel out, feel up to, feeler, feeler gauge, feeling, feet, feign, feigned, feint,