大学英语：undermine vt. weaken (侵蚀…基础;暗中破坏;逐渐损害)

　　1)Many severe colds undermined the old man's health.(多次严重的感冒损害了老人的健康。)

　　2)Failures undermined her confidence. (一再的失败使她渐渐丧失了信心。)

　　3)The foundations of the house have been undermined by groundwater.(地下水侵蚀了这座房屋的地基。)

　　18.jeopardize vt. threaten endanger (使处于危险境地;危及，损害)

　　1)He jeopardized his life to save the drowning child. (他冒着生命危害救护那个溺水儿童。)

　　2)He jeopardized his fortune by making bad investments.(他由于投资不当而危及自己的财产。)

　　3)I didn't want to jeopardize my relationship with my new friend. (我不想损害我和新朋友的关系。)