Under Putin we have the row over US rockets in Europe - this time the Pentagon's plans to site missile defence interceptors and radar bases in Poland and the Czech Republic.

在普京时期，美国不停地在欧洲大量部署导弹——这次五角大楼计划在波兰和捷克部署防御拦截导弹和雷达。

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But NASA 's ambitious plans to put us astronauts back on the moon by 2020 to establish manned lunar bases for further exploration to Mars under the Constellation project are increasingly in doubt.

不过，NASA的雄心勃勃的计划将在美国宇航员重返月球，到2020年建立载人星座项目下进一步探索火星月球基地越来越令人怀疑。

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This week, a panel convened by the White House to review human spaceflight plans said the rocket programme was not viable under the US space agency's present funding.

BBC: Test ignition for 'Moon rocket'

The US system of colour-coded security alerts may be scrapped under new plans being drawn up by security officials.

BBC: US may scrap colour-coded terror alerts

Under the White House and senators' plans, undocumented immigrants would be allowed to live and work in the US legally as long as they pass background checks and pay back-taxes.

BBC: President Obama makes immigration reform push