免掉；避免；摆脱to absolve; to prevent; to get rid of

• 免除某项义务

  absolve from an obligation

• 免除职务

  remove somebody from a post

• 免除罚金

  waive a fine

• 这样就可以免除全区的旱灾。

  That way it is possible to prevent the entire area suffering drought.