energy-saving and cost-reducing的用法和樣例：
例句
- 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(yōu)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(méi)能很好地解決節能降耗問(wèn)題和生態(tài)環(huán)境問(wèn)題。
