Let AB be perpendicular to CD.
设ab垂直于CD。
should be perpendicular to the level set.
必须与水平集垂直。
The wall must be perpendicular to the floor.
墙壁必须与地板成直角。
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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