那些貌似外星人飞碟的东西，数目逐渐增加，但最终都离开了。
The objects - which seem to have been some form of alien discs - increased in number but eventually left .
那位妇女正在买东西，这时看见外星人走出飞碟。
The lady was shopping she saw the alien the ufo .
波罗教授说过外星人通常是乘飞碟的。
David : Professor Polo said men from outer space usually travel by UFO .
外星人飞碟