And what a business, too, trade, my dear, so tawdry.

什么是做生意？不就是做买卖嘛，天哪！这也太俗了吧？

So at that time, Jomo had no clue what a business is.

所以那时候，乔莫根本不知道什么是生意。

A " service" is anything that someone does for you – in this dialogue, what a business does for you.

“服务” 是指某人为您所做的任何事情——在此对话中， 指的是企业为您所做的事情。