It can save energy sources, no need any other exoteric power.

工作时不需外界动力，节省能源。

youdao

Use LED as light source, has advantage of long life, low power consumption, save energy sources.

使用LED光源，具有寿命长，低损耗，节能的优点。

youdao

Compared with the old process, the new process could not only improve the product quality, but also save energy sources obviously.

与原工艺相比较，改造后的工艺不仅使产品产量有所提高，而且节能效果明显。

youdao

It will create jobs, save consumers money, and free America from our dependence on foreign energy sources.

CNN: Can a 'smart grid' turn us on to energy efficiency?