The orintations of these bent bonds through calculation areconsisent with the directions Predicated by the Van der Waals repulsion.Only the bonds in a few moleculesof high symmetry are straight.

• 量子化学计算的弯曲方向与根据范德华斥为预测的方向一致．只有少数高度对称的分子中才存在真正的直线键。