snap up (phr v) to buy or get something quickly and enthusiastically because it is cheap or exactly what you want 搶購 The surgical masks were snapped up within 3 minutes of going on sale online. 該批外科口罩在網上開賣後，三分鐘內就被搶購一空。 stockpile (v) to store a large supply of something for future use 囤積 People have been stockpiling everything from masks and alcohol…
have your head in the clouds to have ideas, plans, etc. that are not realistic 有不切實際的想法；離地 The leader clearly had his head in the clouds to propose such a terrible plan. He should learn to be down-to-earth by listening to the voices of people. 那個領䄂提出一個如此糟糕的計劃，真是很離地。他應聆聽民意，學習如何去貼地。
parallel universe a world that exists in addition to, and is like, the world that we know, but that is also different from it in important ways 平行時空（意指經歷着同一樁事件，但所見及所聞卻截然不同，雙方完全沒有切合點） The high-ranking official is living in a parallel universe. In the real world, people are not noticing any improvement in the economy. 那個高官活在平行時空。在現實中，人民感受不到任何經濟上的改善。
take the law into your own hands to do something illegal and often violent in order to punish someone because you know the law will not punish that person 不透過法律自行懲罰，私下解決 One day, after years of violent abuse from her husband, she took the law into her own hands. 在經受了多年虐待之後，她終於有一天私自報復了她的丈夫。
ulterior motive a secret purpose or reason for doing something 不可告人的動機／原因／目的（等等） He claims he just wants to help Lisa, but I suspect he has an ulterior motive. 他聲稱只是想幫助莉薩，但我懷疑他有不可告人的動機。 She must have some ulterior motive for being nice to me – what does she really want? 她對我這麼好，一定別有用心。她到底想幹什麼呢？ PS I’ve always wanted to share with my students some useful words and expressions…