ex·ac·tion /ɪgˈzækʃən/
 勒索,苛求


 Ex·ac·tion n.
 1. The act of demanding with authority, and compelling to pay or yield; compulsion to give or furnish; a levying by force; a driving to compliance; as, the exaction to tribute or of obedience; hence, extortion.
    Take away your exactions from my people.   --Ezek. xlv. 9.
    Daily new exactions are devised.   --Shak.
    Illegal exactions of sheriffs and officials.   --Bancroft.
 2. That which is exacted; a severe tribute; a fee, reward, or contribution, demanded or levied with severity or injustice.

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 exaction
      n : act of demanding or levying by force or authority; "exaction
          of tribute"; "exaction of various dues and fees"