it is a/the custom (for sb) to do sth
It is a custom to give gifts at Christmas.
圣诞节送礼是一种习俗。
海关；经常重复的行为；许多人共有的行为方式；普通的方式；习惯的做法；生活或行为的方法。；习惯做法；习惯性地从同一供应商购买商品。；长期习俗
a traditional or habitual practice
经常重复的行为；许多人共有的行为方式；普通的方式；习惯的做法；生活或行为的方法。
Frequent repetition of the same behavior; way of behavior common to many; ordinary manner; habitual practice; method of doing, living or behaving.
习惯做法
accepted or habitual practice
习惯性地从同一供应商购买商品。
Habitual buying of goods from one same vendor.
长期习俗
a specific practice of long standing
长期以来被视为不成文法的习俗,基于长期的认可。
Long-established practice, considered as unwritten law, and resting for authority on long consent. Compare prescription.
关税收入
money collected under a tariff
传统信仰或仪式。
Traditional beliefs or rituals.
定制的艺术品等。
A custom (made-to-order) piece of art, etc.
It is a local custom to bow when greeting someone.
鞠躬问候是当地的一种风俗。
用法提示：此处 "custom" 为名词，意为 "风俗"。
Our family has a custom of opening gifts on Christmas Eve.
我们家有在圣诞前夜拆礼物的习惯。
用法提示：此处 "custom" 为名词，意为 "习惯"。
Different countries have different customs regarding table manners.
不同的国家在餐桌礼仪方面有不同的风俗。
用法提示：此处 "customs" 为 "custom" 的复数形式，意为 "风俗"。
It is a custom to give gifts at Christmas.
圣诞节送礼是一种习俗。
customs 用复数形式，指海关。
We had to go through customs at the airport.
我们不得不在机场通过海关。
The custom of shaking hands is widespread.
握手的习俗很普遍。
更侧重个人反复行为，而非群体传统
强调代代相传，常含历史或文化意义
更中性，可指习惯做法或专业操作
多用于社会或行业普遍接受的做法，较正式
强调社会期望或标准，带较强规范性
grammar · medium
易错句子It's a custom for him to take a walk after dinner.
正确表达It's his custom to take a walk after dinner.
custom 表示个人习惯时通常用单数且带所有格，如 'my custom'；而 'a custom' 多指社会风俗。
grammar · medium
易错句子The custom officer checked my passport.
正确表达The customs officer checked my passport.
表示海关时，必须用复数形式 'customs'，如 'customs officer'。
针对‘习惯、风俗’义：与因循守旧、遵循传统相对的创新或变革
habit指个人反复形成的行为习惯，custom指社会群体的风俗习惯
tradition强调世代相传的思想、行为或习俗，时间跨度更长；custom更通用，可指任何群体习惯
custom与costume发音相近，但costume指特定场合穿戴的服装，custom指习惯或风俗
当地风俗
It is a local custom to remove your shoes before entering a home.
进屋前脱鞋是当地的风俗。
古老习俗
The ancient custom of lighting a fire on the solstice is still observed.
冬至点火的古老习俗至今仍被遵守。
做某事的习惯
The custom of exchanging gifts at Christmas is widespread.
圣诞节交换礼物的习俗很普遍。
关税
You must pay customs duty on imported goods.
你必须为进口商品缴纳关税。
海关官员
The customs officer asked to see my passport.
海关官员要求查看我的护照。
遵循习俗
They decided to follow the custom and have a big family dinner.
他们决定遵循习俗，举办一次盛大的家庭聚餐。
与习俗相关的代代相传的实践
习俗是文化的一部分
习俗常包括固定的仪式程序
习俗是社会规范的一种表现
习俗与惯例相近，指普遍接受的做法
店内习俗；惯例
At this pub, it's the custom of the house to buy a round for everyone on your birthday.
在这家酒吧，生日那天为大家买一轮酒是店里的惯例。
行业惯例
Returning unsold goods is a custom of the trade in the book industry.
退回未售出的货物是图书行业的惯例。
按照习俗；习惯上
By custom, the eldest son inherits the family estate.
按照习俗，长子继承家族产业。
习惯是第二天性。
It took a while, but now checking emails every morning is a custom that feels natural, proving that custom is a second nature.
虽然一开始需要时间，但现在每天早上查邮件已经成了自然习惯，证明了习惯是第二天性。
习惯让我们对一切习以为常。
After living in the noisy city for years, the constant traffic sounds became a custom that no longer bothered him, showing that custom reconciles us to everything.
在这个嘈杂的城市住了多年后，持续的车流声成了一种习惯，不再困扰他，表明习惯让我们对一切习以为常。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.