1.Plenty of people play hooky from work to go see a movie on opening day.
很多人在开放日装病不去上班，而是去看电影。
play hooky:
(idiomatic, US) To play truant; to avoid (informally: skip) school, work, or other duties (stay away from these without permission or an excuse); to skive (UK).
Alternative forms:
play hookey:
(intransitive, idiomatic) to be absent without permission, especially from school
2.Teachers should dumb down the textbooks so students can understand easily.
老师应该简化教材，让学生更易理解。
dump down:
(idiomatic, transitive) To convey some subject matter in simple terms, avoiding technical or academic language, especially in a way that is considered condescending.
3.I didn't have time to prepare for the talk in the class, so I just had to wing it.
我没有时间准备课上的发言，所以就即兴说了几句。
wing it:
(idiomatic) To improvise; to make things up or figure things out as one goes; to perform with little or no preparation.
