Exporting the u.s. shale energy revolution overseas turns out to be far tougher than anyone expected -- giving the u.s. a significant competitive advantage .
Gangs from the provinces worst hit shanxi , shaanxi and henan , which all have a particularly rich archaeological heritage have begun exporting their expertise to other regions .
在盗墓活动最猖獗的省份考古资源特别丰富的山西,陕西和河南犯罪团伙正把他们的技能输送到其它地区。
They facilitate trade , as they provide a common interpretation of what constitutes a sound product to importing and exporting countries .