That said, new exchanges are free to introduce contracts that are similar, but not identical, to existing ones-as ICE did so successfully with oil futures.

也就是说，新的交易所可以不受限制的引入此类合约，但不得与现存的雷同——像洲际交易所在石油期货上做的那样。

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Free versions tend to encrypt only Web activity and not E-mail exchanges.

免费版通常只加密web活动但不加密e - mail交换。

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grouping, the Schengen passport-free area and the seven-country Prüm group that is pursuing police exchanges and border co-operation.

欧盟事实上正转型为一个多样化的组织，有欧元区国家组成的俱乐部，有防御分组，有申根护照自由通行区以及从事警务交流和边境合作的七国集团。

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Government has long elbowed its way into these free exchanges, setting rules and regulations for how buyers and sellers must act.

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New, profit-seeking exchanges tend to be free of such wrangling and lighter on their feet.

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Commerce exists where individuals are free to enter into mutually beneficial exchanges.

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