TRADE - [noun] the buying and selling of goods; a particular business or industry
Examples of use
There's a trade agreement between England and China to sell rice.
He took up a new job in tourist trade.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her