He talked with one group about creating jobs by promoting energy efficiency and so-called clean energy.

VOA: standard.2009.12.04

Over here in the lower left corner, we have elements that as a group have very low values of average valence electron energy.

在底层的左侧角落，我们看到以组为单位的,价电子能较低的元素。

麻省理工公开课 - 固态化学导论课程节选

He addressed a group of researchers and entrepreneurs involved in developing new energy technology.

VOA: standard.2009.03.23

In an effort similar to action in the House of Representatives, a bipartisan group of senators introduced legislation targeting Iran's gasoline imports, including companies supporting Iran's energy sector or insuring fuel shipments to Iran.

VOA: standard.2009.04.28