Mutterings that Glencore’s combination of success and secrecy must mean it has something to hide are probably just sour grapes from those who have been on the wrong end of a trade with it.

抱怨嘉能可的成功和神秘一定表明其有不可告人之处，很有可能是与嘉能可做生意吃亏的交易方的一种吃不到葡萄说葡萄酸的心理。

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A combination of over four years of work experience in the trade and some college or industry courses in heating systems installation and repair is usually required for trade certification.

通常需要四年的行业内工作经验，和大学或供暖系统的安装和维修行业的课程组合，才有资格获得行业认证。

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A combination of several years of work experience in the trade and some high school or college courses in small engine or equipment repair are usually required for trade certification.

通常需要多年的行业内工作经验，以及高中或小型发动机或设备维修的大学课程的组合，才有资格获得行业认证。

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Others argue that workers with little education and few skills may be particularly badly hit by the combination of free trade and free labour markets.

ECONOMIST: The end of jobs for life?

Over the last three years, success has been a matter of listening to the market and figuring out which combination of inflation and safety trade is calling the market correctly.

FORBES: Listen To What Gold Is Saying If You Want To Make Money

For trade barriers are the combination of such tariffs and laws with transport costs.

FORBES: Tariffs and Trade: The Tariff Level Isn't the Most Important Thing