I'd better learn not only business English but also...

There are words I won't be able to memorize. One of them is "ambulance".

Whenever I learn English, I put emphasis on business-related words and expressions. Basically I need to speak English just on business now. So even if I couldn't memorize "ambulance" that has nothing to do with business, I didn't care about that.

But! If I work abroad sometime, words for my daily life would become much more important than business English?!
If I were in an accident or something, I couldn't say, "Call an ambulance, somebody!". Ooh, it's in crisis.