be opportunistic meaning in English

投机取巧

Much of good science is opportunistic and revisionist
许多好的科学来自机遇和反复修正。
The modes of propaganda are opportunistic and the polemics can be vicious
宣传的模式是投机取巧的，诡辩是可恶性的。
Mr brown insists that the conservatives ' opposition to his new policy is opportunistic
布朗先生坚称，保守党反对他的新政策是一种机会主义做派。
Although i agree with you on most points , there is one point i will not give in / yield . that is , we must never be opportunistic
尽管我大部分同意你的意见，但有一点我不会让步，那就是我们决不应该投机取巧。