患者，男性，45岁。4个月来低热、盗汗、消 瘦，1个月来劳累后气短。查体：T37 .8℃， 右下肺触觉语颤减弱，叩诊呈浊音，呼吸音消 失，心尖搏动向左移位，心音正常。超声示: 右侧胸腔中等量积液。该患者胸腔积液的性质为

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