Although the usual bonding theories can BE extended to accommodate these compounds, they still provide stimulating problems to BE resolved.
尽管通常的价键理论可加以扩展以适用于这些化合物，但仍然有许多棘手的问题有待解决。
The mid-semester exam covers atomic theories, quantum mechanics theories and chemical bonding.
本次其中考试涵盖了原子理论，量子力学理论和化学键。
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