the pernicious effects of exposure to pornography接触色情作品而导致的不良后果

I did what I could, but her mother's influence was pernicious.我已经尽力了, 但是她母亲对她贻害颇深。

There is a pernicious culture of excellence: everything has to be not merely good but the best.对于优秀存在着一种认识的误区：一切都务求最好。