一个重要的博物馆馆长甚至说这场运动是敲诈行为。
A leading museum director even described the campaign as "blackmail".
私下行为是指非公有的个人或集团的偷窃、盗版、敲诈等行为。
Private action refers to the theft, piracy, blackmail and the like by private individuals or groups.
据称袭击是由于敲诈勒索行为。
It's thought the attack may have been linked to an extortion racket.
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