刀不磨要生锈，人不学要落后
dāo​bù​mó​yào​shēng​xiù​rén​bù​xué​yào​luò​hòu

knowledge is like a blade

  1. 刀 dāo noun
    knife
    knife; blade; single-edged sword; any tool used for cutting, slicing, or carving
  2. 不 bù adverb
    not
    Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings
  3. 磨 mó verb
    to rub
    to rub; to grind; to polish; to sharpen; to wear down; to press against another object
  4. 要 yào auxiliary
    will
    will; shall; to be about to; shows that an action is likely to happen soon or is intended
  5. 生锈 生鏽 shēng​xiù verb + noun
    to rust
    to become rusty; to oxidize on the surface of metal
  6. ， rén
    non-Chinese
  7. 人 rén noun
    person
    person; people; human being; a human
  8. 不 bù adverb
    not
    Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings
  9. 学 學 xué verb
    to study
    to study; to learn; to gain knowledge or skills
  10. 要 yào auxiliary
    will
    will; shall; to be about to; shows that an action is likely to happen soon or is intended
  11. 落后 落後 luò​hòu verb
    to fall behind
    To lag behind others in speed, progress, or position; to fall into the rear during movement.