名詞 mark off:

1. Russian mathematician (1856-1922)
   同義詞：Markov, Andrei Markov, Markoff, Andre Markoff

動詞 mark off:

1. set boundaries to and delimit
   同義詞：mark out
2. put a check mark on or near or next to
   同義詞：check, check off, mark, tick off, tick

1. She wiped the dirty marks off.
   她把臟痕跡擦掉了。
2. The boundaries are clearly marked off on the map.
   邊界的劃分在地圖上標得很清楚。