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[编辑] GRE 红宝书

  • n. 裂缝, 裂纹
  • [英] n. 裂缝, 裂纹 ( line along which sth has broken)
  • [例] a cup with bad cracks in i

[编辑] Webster Collegiate

kI. verb

  • Etymology: Middle English crakken, from Old English cracian; akin to Old High German chrahhōn to resound
  • Date: before 12th century
  • intransitive verb
    • 1. to make a very sharp explosive sound <the whip cracks through the air
    • 2. to break, split, or snap apart
    • 3. fail: as
      • a. to lose control or effectiveness under pressure — often used with up
      • b. to fail in tone <his voice cracked
    • 4. to go or travel at good speed — usually used with on<the steamboat cracked on
  • transitive verb
    • 1.
      • a. to break so that fissures appear on the surface <crack a mirror
      • b. to break with a sudden sharp sound <crack nuts
    • 2. to tell especially suddenly or strikingly <crack a joke
    • 3. to strike with a sharp noise ; rap <then cracks him over the head<cracked a two-run homer in the fifth — New York Times
    • 4.
      • a.
        • (1) to open (as a bottle) for drinking
        • (2) to open (a book) for studying
      • b. to puzzle out and expose, solve, or reveal the mystery of <crack a code
      • c. to break into <crack a safe
      • d. to open slightly <crack the throttle
      • e. to break through (as a barrier) so as to gain acceptance or recognition
      • f. to show or begin showing (a smile) especially reluctantly or uncharacteristically
    • 5.
      • a. to impair seriously or irreparably ; wreck <crack an opponent's courage
      • b. to destroy the tone of (a voice)
      • c. disorder, craze
      • d. to interrupt sharply or abruptly <the criticism cracked our complacency
    • 6. to cause to make a sharp noise <cracks his knuckles
    • 7.
      • a.
        • (1) to subject (hydrocarbons) to cracking
        • (2) to produce by cracking <cracked gasoline
      • b. to break up (chemical compounds) into simpler compounds by means of heat

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