The European languages are members of the same family. Their separate existence is a myth. For science, music, sport, etc, Europe uses the same vocabulary. The languages only differ in their grammar, their pronunciation and their most common words. Everyone realizes why a new common language would be desirable: one could refuse to pay expensive translators.
To achieve this, it would be necessary to have uniform grammar, pronunciation and more common words.
200ml, 6.76 fl.oz.
To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? These cases are perfectly simple and easy to distinguish.