They had blocked the Tennessee River above and below the city.
VOA: special.2009.11.26
Now let's think about this first pi bond, which will be above and below the bonding axis.
让我们先来看这个π键,它在键轴的上面和下面。
The first one will be above and below the bond axis is where we'll see the electron density, and the second will be perpendicular to that, so it will be a density in front of and behind the bond axis.
第一个是在键轴之上和之下,我们可以看到电子密度,另外一个垂直于它,所以在键轴之前和之后有电子密度。
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