Crucially, they form a barrier to exchange between groups, as anyone who has been caught up in a crowd and pulled inexorably in the wrong direction will know.

关键的一点是，拉格朗日拟序结构中的界限可以在群体间互换，正如一个人被挤进了错误的人群接着随着人群驶向错误的方向。

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You can also have multiple exchange schemas in order to represent different message types or groups of different message types.

您也可以具有多个交换架构，以代表不同的消息类型或不同消息类型组。

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Perhaps most menacingly, the Internet's openness allows well-organized groups to simulate support, to "capture and impersonate the public voice," as Mr. Fishkin wrote in an E-mail exchange.

也许最大的威胁是，因特网的公开性让各种有组织的团体冒充支持，以“获取和冒充公众声音，”就像菲什金先生在一封电子邮件回信中所说的那样。

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The prince's Kingdom Holding Company, whose shares are traded on the Saudi stock exchange, owns stakes in hotel groups including Four Seasons and Fairmont Raffles and is a part-owner of the Savoy Hotel in London.

BBC: Forbes list understates my wealth, Saudi prince says

In exchange, Indonesia repeated its pledges to reform its economy and to get tough with the militia groups operating in West Timor.

ECONOMIST: Indonesia trades promises for money

By contrast, workers in groups with a lower frequency of favor exchange were only more productive when they received more favors than they gave.

CNN: Helping yourself by helping others