这是四个极性键按空间对称聚集的结果。
This is the result of the four polar bonds clustering symmetrically in space.
它应该告诉了你，首先，这是一根极性键。
这是四个极性键，按空间对称聚集的结果。
It is an aggregate of four polar bonds, but they are symmetry arranged in space.
甲烷就是一个很好的例子，因为极性键是，空间对称的。
A good example of that is CH4, because the CH bond is polar but symmetrically disposed in space.
空间对称的极性键分布，还是会导致整个分子为非极性分子。
Symmetric disposition of polar bonds still results in a nonpolar molecule.
第二种构成，需要空间非极性，就是需要极性键的空间对称分布。
The second way to have something that is net nonpolar is to have spatially symmetric disposition of polar bonds.
EM35在交换面有五个极性键来确保对振动正确定位和稳定性。
The EM35 has five polarising keys in the mating face to ensure correct mating positioning and stability against vibration.
EM35在交换面有五个极性键来确保对振动正确定位和稳定性。
The EM35 has five polarising keys in the mating face to ensure correct mating positioning and stability against vibration.
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