The Congressional Research Service says it is hard to tell.

国会研究中心称这一点很难说。

There have been 20 shutdowns since the 1970s, according to the Congressional Research Service.

根据国会研究服务部的数据，自20世纪70年代以来，已经有20次政府停摆的记录。

According to a report from the Congressional Research Service there were 294m guns in the country in 2007, up from 192m in 1994.

根据国会研究服务报道，美国2007年拥有2亿9400万支枪，而在1994年才仅有1亿9200万支。

Using two totally different methods, the Congressional Research Service published a report for the US Congress and measured the Alaskan coastline at 10,960 kilometers.

使用两种完全不同的方法，国会研究处为美国国会发表了一份报告，测量出阿拉斯加的海岸线长 10960 公里。