Difference between the social systems of states should not be an obstacle to their cooperation.

国与国之间不同的社会制度不应该妨碍彼此的合作。

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Differences between the social systems of states shall not be an obstacle to their approachment and co-operation.

各国社会制度不同，但不应妨碍彼此接近与相互合作。（转换成汉语偏正复句的转折句）

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US President Bush will soon give Russia notice that the United States is withdrawing from the 1972 nucleartreaty that bans testing of missile defense systems.

美国总统布什将很快通知俄罗斯，美国将退出1972年禁止测试导弹防御系统的核条约。

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Lawmakers in the United States have expanded an investigation into the use of location-tracking systems on mobile devices.

VOA: special.2011.05.02

In the wake of the bombings, cities in the United States and Europe boosted security in and around their mass transit systems.

VOA: standard.2010.03.30

Supporters of EU accession say it would bring EU law into line with the legal systems of member states, and a draft agreement on EU accession to the ECHR was reached during 2011.

BBC: MEPs clash over EU accession to ECHR

The United States and Poland also emphasized the continued need for practical actions to prevent the spread of weapons of mass destruction (WMD) and their delivery systems to states of proliferation concern and to terrorist groups.

WHITEHOUSE: President Obama Meets with Polish President Komorowski

Interconnection of member states' pipeline systems, the completion of new pipelines from Norway and the construction of further LNG terminals have the potential to allow the EU25, or at least the major West European economies, to dramatically diversify their gas supplies.

ECONOMIST: Don't worry, there won't be an effective gas cartel