1
compact sth
作“压紧、压实”解时是及物动词，直接接被压的物体。
The machine compacts the waste.
这台机器把废料压实。
压缩；压实
compacts — third person singular of compact
先理解核心含义，再看它在真实句子里的用法。
压缩；压实
To make something denser or more compressed; to press together firmly.
The machine compacts the waste.
这台机器把废料压实。
订立协议或合同。
To form an agreement or contract.
使更致密；压缩。
To make more dense; to compress.
使紧密结合或连接,如在一个系统中。
To unite or connect firmly, as in a system.
compact
Base
原形
compacts
3rd person
第三人称单数
compacting
-ing
现在分词
compacted
Past
过去式
compacted
Past participle
过去分词
The machine compacts the waste into blocks.
这台机器将废物压缩成块。
They compacted the soil to make a solid foundation.
他们压实了土壤以建造坚固的地基。
The trash has been compacted to save space.
垃圾已被压缩以节省空间。
规则变化动词，注意及物和不及物用法。
The machine compacts the trash into small bales.
这台机器把垃圾压缩成小捆。
They compacted the soil to make a solid foundation.
他们压实了土壤以建造坚固的地基。
The factory is compacting the waste materials for recycling.
工厂正在压缩废料以便回收。
作“压紧、压实”解时是及物动词，直接接被压的物体。
The machine compacts the waste.
这台机器把废料压实。
常以被动形式出现，强调多个部分被压合成一个整体。
The layers are compacted together to form a strong base.
这些层被紧紧压实在一起，形成坚固的地基。
该义项较正式，表示订立契约或达成协议，后接 with 引出缔约方。
The two parties compacted with each other to end the dispute.
双方相互缔结协议，以结束争端。
Not this
The soil compacted by the heavy rain.
Use this
The soil was compacted by the heavy rain.
compact 作及物动词表示“压实、压缩”，主动语态必须带宾语；“by the heavy rain”是被动结构，所以要用 be 动词加过去分词 compacted，写成 was compacted。
Not this
The machine compacts the waste to small blocks.
Use this
The machine compacts the waste into small blocks.
compact…into… 表示“把……压实成……”，强调压缩后形成的形状或状态；into 比 to 更能表达“变成”的结果，to 一般只表示方向。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
压实土壤
You should compact the soil before laying the foundation.
铺设地基前应先压实土壤。
压缩垃圾
The machine compacts waste into small blocks.
这台机器把垃圾压缩成小块。
被压实的雪
The path was covered with compacted snow.
小路上覆盖着被压实的雪。
紧密压实
The material compacts tightly under pressure.
这种材料在压力下会紧密压实。
压缩成更小的体积
The recycler compacts plastic bottles into a smaller volume.
回收机将塑料瓶压缩成更小的体积。
Use compacts naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 compact 拆成 com（共同）+ pact（协议）来记：大家共同把物体压实，也共同敲定协议。
语域：formal 常见场景：technical writing、construction、waste management 作动词表示“压实、压缩”时，通常用于正式或技术性语境，如工程、环保、科学写作；日常口语中较少出现，更常用 compress 表达。
作为动词时，既可作及物动词（使紧密结合/压缩），也可作不及物动词（变坚实）。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.