This could be a serious problem. The shield protected the spacecraft from burning up from the extreme heat of re-entering the Earth's atmosphere.

VOA: special.2009.06.17

And let's say our second electron now is really far away, such that it's actually not going to shield any of the nuclear charge at all from that first electron.

距离原子核非常非常近,我们说第二个电子处于非常远的位置,这样它不会对第一个电子,感受到的来自原子核的电荷量有任何屏蔽作用,我们最后要说的是。

麻省理工公开课 - 化学原理课程节选

(..) One woman in Warsaw explains that she was happy the shield was canceled because she does not think Poland needs to be defended from anyone,even Russia.

VOA: standard.2009.10.21

Nicholas Lardy, an economist and senior fellow at the Washington-based Peterson Institute, says China's unwillingness to adopt derivative loans and other high-risk financial products helped to shield it from the impact of the world economic downturn.

VOA: standard.2009.11.10