1.trade用作动词的基本意思是从事贸易、做买卖或进行商品交换。引申可指交换位置、交换邮票等。
2.trade既可用作及物动词,也可用作不及物动词。用作及物动词时,接名词或代词作宾语,常与for, in等连用; 用作不及物动词时,常与on〔upon〕, with等连用,还与at连用表示“在…买东西”,多用于美式英语中。

trade at(v.+prep.)
在…买东西 buy goods at (usually a particular shop)
▲trade at sth
They are trading at a store.他们正在商店买东西。
Which store do you usually trade at?你常在哪个商店买东西?

trade for(v.+prep.)
用…换 exchange sth by sth
▲trade sth for sth
The boy traded his skates for a cricket bat.这个男孩子用他的溜冰鞋换了一个板球拍。
The early settlers traded copper for corn.早期的殖民者用铜来换玉米。
I would love to trade this car for a pickup truck.我愿意用这辆汽车换一辆小型轻便卡车。
They landed on the island and traded knives for gold dust.他们登上岛后,用刀子去换金沙。
Early European visitors to the North of Canada traded manufactured goods for furs and skins.早期到加拿大北部的欧洲来客用工业品换取毛皮。
He traded a job in New York City for the life of a cowboy.他放弃了在纽约的工作,去过牛仔生活。

trade in1(v.+adv.)
折价换取 surrender sth in part-exchange when buying sth else
▲trade sth⇔in
They trade in their car every three years.他们每三年就以旧汽车贴换新车。
I have traded my old radio in for a transistor.我把那台旧收音机折价换了一台半导体收音机。
The gas company is offering fifty pounds off a new cooker if you trade in your old one.如果你用旧炊具来折价的话,那家煤气公司愿减价50镑出售一套新炊具。

trade in2(v.+prep.)
出售,经营 sell a certain kind of goods; engage in sth
▲trade in sth
They traded in fruit and vegetables.他们经营水果和蔬菜。

trade off(v.+adv.)
〈非正〉交换物品或人 exchange one thing or people for another
▲trade sb/sth⇔off
The two armies agreed to trade off their prisoners.两军同意交换俘虏。
They traded off horses hundreds of miles from home.他们到离家几百里外的地方用马匹换别的东西。

trade on〔upon〕(v.+prep.)
(不公正地)利用 take (unfair) advantage of sth
▲trade on〔upon〕 sth
The senator's son traded on his father's name when he ran for mayor.参议员的儿子在竞选市长时利用他父亲的名气。
They traded on his credulity.他们利用了他的轻信。
I'm tired of the way in which he trades on your generosity and I think it is time you put an end to it.我讨厌他那样利用你的慷慨大方来获取好处,我认为你不应当让他这样干。

trade with(v.+prep.)
与…进行贸易〔交换〕 have dealings with sb; change with sb
▲trade with sb/sth
We don't trade with that company.我们和那家公司没有贸易往来。
We trade with many countries in industrial and agricultural products.我们与许多国家在工农业产品方面进行贸易。
China now trades with more than 130 countries.中国现在和130多个国家进行贸易。
He wanted to change his days off and got a fellow worker to trade with him.他想换休,找一位同事和他对调。
▲trade sth with sb
Rosa traded seats with Cage.罗莎和凯奇对换了座位。

用作不及物动词
▲S+～(+A)
He traded as a tobacco merchant.他是做烟草生意的商人。
To trade is to buy and sell things.经商就是买卖东西。
用作及物动词
▲S+～+n./pron.
They were persuaded to trade information.他们被说服出卖情报。
They traded seats.他们互换座位。

［同义词］ n.  business, commerce, dealing, traffic, craft, learning, livelihood, occupation, profession v.  barter, exchange, swap
［词源］  ＜中古低地德语trade,古英语＜古瑞典语trad

1.trade用作名词表示一般性非具体的“买卖,贸易,生意”时,是不可数名词,其前一般不加冠词。
2.trade用作可数名词时,可表示“具体的生意或行业”“谋生手段,手艺,职业”等。作“生意”解时,通常后接介词in引导的短语,表示“…方面的生意”; 作“谋生手段,手艺,职业”解时,通常指需要特殊手工的技巧。
3.trade还可作集合名词,在英式英语中是“(从事某行业的)同仁,同行,同业”的总称,在美式英语中是“顾客,主顾”的总称,此时通常要加定冠词the,只有单数形式。当其在句中充当主语时,其谓语动词既可用单数形式,也可用复数形式。

This town carries on a brisk trade.这市镇贸易很昌盛。
Foreign trade kept the country's economy healthy.对外贸易使国家的经济健康发展。
By the end of a year the little seed and grain shop had developed its trade considerably.到年底,那个种子、粮食小店的生意有了相当大的发展。
He is in trade.他经商。
None are genuine unless bearing the above trademark.无此商标者均系伪造。
He got a job as editor of a trade journal.他找到了一份当商业杂志编辑的工作。
Wu Yi Mountain City earns most of its income from the tourist trade.武夷山市的大部分收入来自旅游业。
Words are the tools of her trade.言语是她那一行必不可少的工具。
He is a jack of all trades and master of none.他样样都懂一点,但都不精通。
She made a good trade.她做了一笔好生意。
Being a printer is a trade; being a lawyer is a profession.当印刷工是一项需要有手艺的行当,当律师则是一门专业。
Basket-weaving is a dying trade.编篮子这一行已逐渐衰弱。
We offered discounts to the trade.我们对同行给予优惠。
They only sell cars to the trade, not to the general public.他们只向经销商出售汽车,不卖给一般人。
That store has a lot of trade.那商店有许多顾客。
▲～+in n.
The new shop has been doing a brisk trade in cut-price clothes.那家新商店做减价服装生意一直很兴隆。
Outside the scene he was doing a good trade in souvenirs.在景点外,他经销纪念品的生意不错。

trade, business, occupation, profession, vocation
这组词都有“职业,工作”的意思。它们之间的区别是：business使用广泛,在日常生活中,可泛指“事情”,尤指自己负责管理的事情; 在社会经济生活中,多指生意,尤指以赢利为目的的买卖或商业中的工作。occupation可以泛指各种专业。profession指必须受过相当高的教育或专门训练才能从事的知识性职业,如律师、医生、建筑师等。vocation指专心从事的业务,除谋生的行业外,还包括专门爱好。trade则是指涉及体力或手工劳动、手工操作机械或工具的职业。例如:
That's no business of yours.那事与你无关。
Mind your own business.管你自己的事,少管闲事。
A lot of the U.S. small grocers have gone out of business since the advent of the supermarkets.超级市场一出现,大批美国食品杂货店就歇业了。
She got a sideline occupation.她从事第二职业。
She left her teaching profession and became a secretary.她放弃教书的职业改行当了秘书。
Mr. Brown is a laｗyer by profession.布朗先生的职业是律师。
He chose painting as his vocation.他以绘画为专业。
He is in the silk trade.他做丝绸生意。
trade, commerce
参见commerce条。