1
go through customs
常用短语，指通过海关检查。
We had to go through customs at the airport.
我们必须在机场过海关。
海关
先理解核心含义，再看它在真实句子里的用法。
海关
the official department that collects taxes on imported goods
We had to go through customs at the airport.
我们必须在机场过海关。
常大写，如Customs
对进出口货物征收的关税
The duties or taxes imposed on imported or exported goods.
关税收入
money collected under a tariff
负责征收进口货物税的政府部门或机构
The government department or agency that is authorised to collect the taxes imposed on imported goods.
在边境检查站进行海关检查的过程
The process of going through customs checks at a border checkpoint.
You must declare any goods over the limit at customs.
你必须向海关申报超限额的物品。
The shipping company paid the customs on the imported machinery.
船运公司支付了进口机器的关税。
Our luggage was held up by customs for inspection.
我们的行李被海关扣留检查。
常用短语，指通过海关检查。
We had to go through customs at the airport.
我们必须在机场过海关。
固定搭配，指关税。
You must pay customs duty on imported goods.
你必须为进口商品支付关税。
指海关工作人员。
The customs officer asked to see my passport.
海关官员要求查看我的护照。
表示在海关场所。
My luggage was inspected at customs.
我的行李在海关接受了检查。
Not this
I have to go through the custom.
Use this
I have to go through customs.
混淆了 "custom"（习惯）与 "customs"（海关）。表示海关机构时，必须使用复数形式 "customs"。
Not this
I paid the custom duty.
Use this
I paid customs duty.
在复合名词“海关关税”中，应使用复数形式 "customs" 作为定语，而不是单数 "custom"。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
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通常用复数形式，指海关或关税
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT, WIKTIONARY.