因此，基本上他在这里展示是这些立方体中一共有,八个位置，需要把它们都填满才得到一个完整的立方体。

So, basically what he's showing in these cubes is that there are eight spaces that need to be filled up to have a full cube.

youdao

由于我将立方体的中心点放在坐标系原点位置处，因此立方体的各边长应为 2 个单位。

Remember that I placed the cube's center at the coordinate system's origin; therefore, the cube's edges will be two units long.

youdao

由于立方体有8个顶点，支持法线的方法之一就是指定从立方体中心指向各角的向量，如图7a所示。

Because the cube has eight vertices, one way to supply normals would be to specify vectors that point from the cube's center toward its corners, as Figure 7a shows.

youdao

So, basically what he's showing in these cubes is that there are eight spaces that need to be filled up to have a full cube.

因此，基本上他在这里展示是这些立方体中一共有,八个位置，需要把它们都填满才得到一个完整的立方体。

麻省理工公开课 - 化学原理课程节选

So, let's go back to the notes, and let's fill these in, seven electrons. Another way you could have known them was to look at Lewis' notes here, where if look at this box carefully you see there are seven dots around the cube, so there are his seven valence electrons.

那么，让我们回到讲义，把它们填进去，七个电子，还有另外一种方法可以知道这些,那就是看看路易斯的讲义这里，大家可以看到这个立方体周围有七个点,因此有七个价电子。

麻省理工公开课 - 化学原理课程节选