In the debate about how to solve the crisis and prevent the next one, it has been suggested that policymakers should ban short selling and impose a transaction tax on stocks.

在关于如何应对此次危机和防止危机再次发生的讨论中，专家学者建议政策制定者应该禁止做空，并且增加股票交易税。

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On Wednesday Greece said that it would ban the short-selling of shares for two months to prevent speculators doing further damage to the country's Banks.

本周三希腊宣布将禁止放空股票两个月来避免投机者进一步伤害到该国的银行。

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Russian officials said Moscow would ban British poultry imports from Tuesday to prevent the spread of bird flu.

俄罗斯官方说，莫斯科将从星期二开始禁止从英国进口家禽以防止禽流感的蔓延。

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Ban Ki-moon told reporters this conference must be the turning point in global efforts to prevent runaway global warming and usher in a new era of environmentally sustainable growth.

VOA: standard.2009.12.09

While its regular season record leaves much to celebrate, a one-year NCAA bowl ban will prevent the Buckeyes from appearing in a bowl game this season.

FORBES: Not Self-Imposing a Bowl Ban in 2011 May Have Cost Ohio State Millions

The agency says almost 90 percent of adult smokers picked up the habit as teenagers, and it estimates the 2009 ban helps prevent an average of more than 3, 600 young people each day from starting to smoke.

WSJ: NY Cancer Society says sweet smokes aimed at kids

For example, the Comprehensive Test Ban will not prevent states determined to acquire nuclear weapons from simply buying them.

CENTERFORSECURITYPOLICY: Center For Security Policy