单词学习：opportunistic 形容词
opportunistic
/ˌɒpətjuːˈnɪstɪk/
机会主义的；投机取巧的；伺机而动的
The opportunistic student tried to impress 顾老师 by only participating when important visitors were in class.
那个机会主义的学生试图给顾老师留下好印象，只在有重要访客听课时才积极表现。
单词卡片
卡片已就绪
