They don't really, in their ivory towers, understand how pernicious drug crime is.
身处象牙塔里，他们并不真正懂得毒品犯罪多么有害。
《柯林斯英汉双解大词典》
2
The kind of paper that purports to show that people who eat more than one kilo of broccoli a week were 1.17 times more likely than those who eat less to suffer late in life from pernicious anaemia.
这类论文声称，每周吃超过一公斤西兰花的人晚年患恶性贫血的几率是那些吃得少的人的1.17倍。
3
I did what I could, but her mother's influence was pernicious.