It's a great experience. All these opportunities I have been able to do like fly a plane, archery,or trap shooting, rifle shooting,anything like that, and I have gotten great leadership experience."

VOA: standard.2010.07.31

So even though we see a nodal plane down the center, I just want to really point out that it's only when we have a nodal plane in the internuclear or the bond axis that we're calling that a pi orbital.

虽然在中间有个节面，我想要指出的是,只有节面在核间轴,或者键轴上时,我们才叫它π轨道。

麻省理工公开课 - 化学原理课程节选

The plane that's ready to take off or is taking off is not such a system.

但即将起飞或正在起飞的飞机并不是这种系统

耶鲁公开课 - 基础物理课程节选