充当: serve as; act as; play the part of; pose as 短语和例子充当辩护士 play the part of an apologist; 充当翻译 act as interpreter; 充当炮灰 serve as cannon fodder; 充当一般等价物 act as a universal equivalent; 她不得不去那户人家
人质: hostage 短语和例子被扣作人质 be held as a hostage; 人质危机 hostage crisis
