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紧密状态的英文：
compaction compaction是什么意思：
n. 压制，压实作用；紧密状态
To become compact or solid;cohere.
凝固使坚实或变硬；粘着紧凑 I want to buy a compact.
我想买一个小粉盒。 The Smith boy was compacting the trash.
史密斯家的男孩在把垃圾压紧。 A compact flat,car,kit
小型的单元、汽车、箱子等 Not taut, firm, or compact; slack.
松弛的不紧、不严密或不坚实的;放松的 | 
