中国存在很多问题。
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，中国基于区域经济合作的人力资源开发与整合尚处于起步阶段，因而存在着很多问题。
However, since the development and integration of the human resource based on regional economic cooperation in China is still at the starting stage, there are lots of questions.
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