opportunism
/ˌɔpəˈtju:nɪzəm; ?@ -ˈtu:n-; ˌɑpɚ`tunɪzəm/n [U]
(esp derog 尤作贬义) looking for and using opportunities to gain an advantage for oneself, without considering if this is fair or right 机会主义
political opportunism 政治上的机会主义
a record of shameless opportunism 空前无耻的机会主义历史.