形容詞 extracurricular:

1. outside the regular academic curriculum
2. outside the regular duties of your job or profession
3. characterized by adultery
   同義詞：adulterous, extramarital

1. Nathan has extracurricular activities. He's on the basketball team.
   納森參加了很多課外活動，他是個籃球隊員。　
2. John has extracurricular activities. He's on the football team.
   這是我進入學院的第一年，我是新生。約翰參加了很多課外活動，他是個足球隊員。
3. We should take active part in extracurricular activities.
   我們應該積極參加課外活動。

ex.tra.cur.ric.u.lar

adj.（形容詞）
Being outside the regular curriculum of a school or college:
課程以外的：在學校或?qū)W院設置的固定的課程以外的：
例句：
Sports and drama are the school`s most popular extracurricular activities.
體育和戲劇是學校最流行的課外活動

Being outside the usual duties of a job or profession:
業(yè)余的：在平常工作或職業(yè)的義務之外的：
例句：
The attorney`s work for the legal aid society was extracurricular.
律師對社會予以合法的援助是業(yè)余的

Informal Extramarital.
【非正式用語】 私通的