Non-native English speaking researchers are used to communicate, write their scientific papers and present at international conferences by means of the English language. But sometimes they have to spend time researching in a so-called "neutral country", which is not English-speaking, nor the researcher's native language speaking. I personally consider a matter of respect and scientific courtesy learning the basics in order to communicate with local people. Some of my colleagues say English is OK and enough, we're scientists and our work needs that. What do you think?