Civil society groups are calling on President John Atta-Mills' government to draw up a comprehensive biofuels policy to reconcile these issues.

VOA: standard.2009.08.23

And, I know I need to come up with four symmetric equi-length bonds, and let's just see, let's draw the structure here.

我想我们需要,4个对称的等长的键，让我们画出CH4的结构。

麻省理工公开课 - 固态化学导论课程节选