A is due to the presence of B not participating in C and of D.
我翻的是：A主要是由於B的出現所造成，並沒有牽涉到C，有不含有D.
但是我不確定not participating in C and of D，是形容A，還是形容B，
也不確定of B和of D否平行。
煩請版上高手指點
感激不盡
原文如下：
The optical polarizability is due mainly to the presence of delocalized
electrons not participating in chemical bonds and of a π electrons.
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