n. 裂缝, 裂纹；板间间隙；龟裂（crack的复数形式）

n a long narrow opening

n a narrow opening

n a long narrow depression in a surface

n a sudden sharp noise

n a chance to do something

n witty remark

n a blemish resulting from a break without complete separation of the parts

n a purified and potent form of cocaine that is smoked rather than snorted; highly addictive

n a usually brief attempt

n the act of cracking something

v become fractured; break or crack on the surface only

v make a very sharp explosive sound

v make a sharp sound

v hit forcefully; deal a hard blow, making a cracking noise

v pass through (a barrier)

v break partially but keep its integrity

v break suddenly and abruptly, as under tension

v gain unauthorized access computers with malicious intentions

v suffer a nervous breakdown

v tell spontaneously

v cause to become cracked

v reduce (petroleum) to a simpler compound by cracking

v break into simpler molecules by means of heat