incumbent [ɪnˈkʌmbənt]

例句:

• It is incumbent upon all of us to make an extra effort.
  我们所有人都必须加倍努力。
  来自柯林斯例句
• the present incumbent of the White House
  现任美国总统
  
• He defeated the incumbent governor by a large plurality.
  他以压倒多数票击败了现任州长.
  
• His main rival is the incumbent President Mahinda Rajapaksa.
  来自VOA
• The term of incumbent President Jacques Chirac expires in May.
  来自VOA
• Incumbent Bashir is re-elected for further five years.
  来自BBC
• Bush is the incumbent president of the United States.
  布什是美国现任总统。
  来自《权威词典》
• It is incumbent upon us to do so.
  这样做是我们义不容辞的责任。
  来自《权威词典》
• It is incumbent on you to provide for your parents.
  供养父母是你应尽的义务。
  来自《权威词典》