Take a second leaf and fold the center point down.
拿第二张叶子,把中间的叶尖折下。
We're just like a compass and she is the center point.
我们就像是圆规而她就是圆心。
We’re just like a *compass and she is the center point.
我们就像是圆规而她就是圆心。
Angus Nicoll of the European Center for Disease Prevention says that at this point no one knows whether the virus will become more or less virulent in the months ahead.
VOA: standard.2009.04.30
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。
er is a vector at each point of length one pointing radially away from the center.
r 是一个模长恒为 1 的矢量,方向沿半径向外
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