trad本身有名词的词性，意为贸易、交易。形容词是trading 交易的；贸易的。
例句：
I am willing to make a trade with you.
我愿意和你做个交易。
Trading was very light ahead of yesterday's auction.
昨天的拍卖之前交易很少。
Spain has been one of Cuba's major trading partners.
西班牙一直是古巴的主要贸易伙伴之一。
Poor trading figures put back our plans for expansion.
贸易额不佳延缓了我们的扩张计划。
Trade was very good last month.
上月的交易量很大。
America's trade gap widened.
美国的贸易差额加大了。
Carpentry is a highly skilled trade.
木工是需要纯熟技巧的职业。
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