They save energy, increase efficiency, raise productivity and so help to keep costs under control.

不仅可以节约能源，提高效率，提高生产力，而且有助于控制成本。

youdao

They save energy, increase efficiency, raise productivity and so help to keep costs under control.

不仅可以节约能源，提高效率，提高生产力，而且有助于控制成本。

youdao