Real time voice translation is getting really good. Standard text translation is pretty much perfect for technical details, but just may miss idioms. You just have your smartphones out, type your message, and show the translation to the other person. They read it and start typing on their phone, then show it to you. I got through China pretty painlessly this way, and it is so normal for many, especially the young. I went to one restaurant where they got the younger waiter when they saw me walk in, who I thought would speak English. She just knew the phone text translation ritual, but was an expert in that.

But for millennia, people have gone to far away lands where they don't speak the language, and somehow managed to build trade routes without even having a dictionary or calculator. It is not that hard to work out a pidgin. Tons of things you can do with pointing and gesturing. Marco Polo would have killed to even have Google Translate circa 2010.

I'll also assert with no evidence that it is generally harder for an English speaking engineer to successfully communicate a technical idea into business speak for English speaking VC investors than it is for an English speaking engineer to communicate a request to buy a specific part to a Mandarin speaking engineer.