noun [抽象名词] 裂纹，裂缝；爆裂声，噼啪声；分馏
Mark, you'd better get cracking, the sooner the better. 马克，你最好马上做这件事，越快越好。
adjective [原级] 出色的，极好的；快而令人兴奋的
She's always cracking jokes. 她总爱说笑话。
verb [vt. 及物动词] 破裂；发爆裂声；打开；重击；变声（crack 的现在分词）
The old institutions are cracking. 旧的制度正在瓦解。
adverb [程度副词] 非常，极其
That was a cracking goal. 这球进得真精彩。
