So far, China's efforts to rein in its roaring energy use have been mixed. 目前為止，中國節能降耗努力所取得的成效喜憂參半。
Unsustainable development means that we have not done well in saving energy and resources and protecting the environment. 所謂不可持續，就是我們還沒能很好地解決節能降耗問題和生態環境問題。
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