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crack·ing AHD[krăkʹĭng] D.J.[ˈkrækɪŋ]K.K.[ˈkrækɪŋ]n.Chemistry（名词）【化学】- Thermal decomposition, sometimes with catalysis, of a complex substance, especially the breaking of petroleum molecules into shorter molecules to extract low-boiling fractions such as gasoline.裂化：有时通过催化作用对复合物的热分解，尤指把石油分子分解成更小的分子并提取低沸点的分馏部分，如汽油
adj.（形容词）- Excellent; great:优秀的；美妙的：had a cracking time at the dance.在舞会上玩得很愉快
adv.（副词）- Used as an intensive:用于加强语气：a cracking good show.极其精彩的表演
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