For many years , the commodities sector was an economic backwater .
许多年间，大宗商品行业曾是经济中的一处回水。
If policymakers leave commodities trading unattended , this erstwhile backwater could one day become a sea of economic troubles .
如果政策制定者们对大宗商品交易放任不管，这一昔日的回水可能有朝一日会变成经济的麻烦之海。
We didn 't see any river rocks , but this kind of lamination looked a lot like lake or backwater channel deposits .
我们不再看到河流岩石，但是这种层压看起来更像湖泊或回水通道沉积物。
To protect against future flooding , check with a plumber to have a backwater valve installed , because it sounds like your home currently does not have one .
防患于未然，请一个水管工安装一个回水阀，因为听来似乎你家现在没有装。
These deposits look suspiciously like some kind of lake or backwater channel deposits , but they are several hundred meters above the current valley floor and underneath loess deposits in terraces .
