名詞 red ink:

1. the amount by which the cost of a business exceeds its revenue
   同義詞：loss, red

動詞 red ink:

1. mark with red ink
   同義詞：red-ink

1. Don't write your exercise in red ink.
   不要用紅墨水寫練習。
2. Do not write your exercise in red ink.
   不要用紅墨水寫你的練習。
3. How much red ink is there in the ink-pot?
   墨水瓶里有多少紅墨水？
4. He has run out of red ink.
   他的紅墨水用完了。