up on one's soapbox是什么意思？从字面上理解，它是指站上肥皂箱，19世纪时，空肥皂箱最显著的用途之一就是充当政治家的临时演讲台，因此，up on one's soapbox表示某人把交谈变成了一个人的演说。

链接：
停止说教：get off one's soapbox

1.The principal is up on his soapbox about the important of study.
校长总是喋喋不休地讲学习的重要性。

2.If he notices an empty cigarette box in an office wastepaper basket, the boss will soon be up on his soapbox about the dangers of smoking, lecturing on it at length at every chance he gets.
一旦发现办公室的废纸篓里有空的香烟盒，老板马上激烈地谈论吸烟的危害，抓住每次机会宣讲。

3.If anyone mentions food she gets on his soapbox and tells us all how evil it is to eat meat and how healthy we would all be if we ate only vegetables.
如果有人提起食物，她就要大发议论，告诉我们大家吃荤是如何有害，要是全吃素，就会如何如何有益于健康。