tariff和tax和duty的区别：含义不同、词性不同、用法不同。tariff只作名词，含义为“关税”、“收费表”；tax可作名词和及物动词，含义为“税款”、“对…征税”、“使负重担”、“使大伤脑筋”；duty作为名词，含义为“责任”、“任务”、“上班”。
一、tariff的意思及用法
tariff作为名词，译为关税;(旅馆、饭店或服务公司的)价目表，收费表;量刑标准。
例句：America wants to eliminate tariffs on items such as electronics.
美国打算取消电子产品等的关税。
A general tariff was imposed on foreign imports.
国外进口货物当时按普通税率征税。
Its tariffs cater for four basic classifications of customer.
它的价目表适合4个基本类别的顾客。
The decision to raise tariffs on imports will only add fuel to the fire.
上调进口关税的决定只会火上浇油。
High tariffs often cause a persion of trade from one country to another.
高额关税常使贸易由一国转向另一国。
二、tax的的意思及用法
tax可作名词和及物动词，译为税;税款；对…征税;课税;使纳税;缴纳车辆牌照税;使负重担。
例句：His declared aim was to tax the rich.
他宣布他的目的是向富人征税。
The car is taxed until July.
这辆汽车的牌照税缴纳到了七月。
The questions did not tax me.
那些问题没有让我费脑筋。
Husband and wife are now taxed separately on their incomes...
现在夫妻双方分别按各自的收入纳税。
Overcrowding has taxed the city's ability to deal with waste...
人口过多使得城市的垃圾处理能力达到了极限。
三、duty的意思及用法
duty作为名词，译为责任;义务;职责;值班;任务;本分;上班。
例句：It is my duty to report it to the police.
把这事报告给警方是我的责任。
I spend a lot of my time on administrative duties.
我在行政管理事务上花了大量时间。
Staff must report for duty at their normal place of work...
职员必须在平时上班的地方签到。
I carried out my duties conscientiously...
我一丝不苟地履行我的职责。
I consider it my duty to write to you and thank you.
我认为写信向你表达谢意是我的责任。
