Recently I recommended a young Chinese stock, Duoyuan Global Water (DGW). The company makes water-processing equipment for a wide variety of uses, from high-purity sterilizers for pharmaceutical companies to high-volume grit and sludge processors for wastewater treatment plants. Business is booming, because China is booming and Duoyuan is the leading company in the industry. It’s a simple story … with big potential. Since I wrote about it, the stock has soared from its small base at 30 to a record high of 36, and I think more progress will come in time. But a well-deserved pullback began today, so...