超级灯管，作为一项产品，还存在很多问题。
And the SuperBulb, as a product, was turning out to have some problems.
鉴于中国对煤的依赖，电动车的环境效益还存在很多问题。
There are also many questions about the environmental benefits of electric cars, given China's reliance on coal.
然而，在这貌似大胆的外表下，曾经——现在也还存在很多问题。
Yet there were, and are, many cracks in this apparently bold facade.
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