6.

胸腔积液生成曲线：接种后第10天发现血性胸腔积液，量约0.1 mL，随接种时间延长，胸水平均体积逐渐增加，第16天达到高峰0.5 mL，此后维持在0.3 mL-04 mL之间。

The formation curve of malignant pleural effusion. The nude mouse were sacrificed periodically after incubation, bloody pleural effusion was seen at day 10 and the volume was 0.1 mL. Mean volume of pleural fluid increased gradually after inoculation, which reached in a peak at day 16 and the value is 0.5 mL. Since then, it maintained between 0.3 mL-0.4 mL.