《后汉书·列传·东夷列传》
侍女说： 之前见到天上有个气团，有鸡蛋那么大，降到我的身上，就这样有了身孕。 
侍兒曰： 前见天上有气，大如鸡子，来降我，因以有身。 
The maid said: I saw a ball of gas in the sky before, it was as big as an egg, it landed on me, that's how I got pregnant.