逃课to play truant

• 我慢慢了解了弟弟的生活：撒谎、跷课、恶作剧。

  I slowly came to understand my little brother's life: lying, skipping class, and playing pranks.

• 百分之八十的大学生在大学期间都曾跷课。

  80% of students at university have skipped class.