这也说明了对于单取代苯衍生物，取代基在致毒作用中可能起重要作用。

It is also showed that substituents could play an important role in the toxic effect of mono-substituted benzene derivatives.

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利用ZINDO/SOS方法，从理论上研究了对称和不对称取代两种情况下，取代基对二噻吩并噻吩衍生物单双光子吸收性质的影响。

In order to investigate the effect of substituents on the two-photon absorption properties(TPA), the one-and two-photon absorption properties were theoretically studied by using ZINDO/SOS method.

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