It's easy to start learning another language without an interpreter or dictionary, you just start with concrete objects and actions. The hard part is represent

It's easy to start learning another language without an interpreter or dictionary, you just start with concrete objects and actions. The hard part is representing the sounds (phonemes), which are often quite different from the language the learner knows. It helps that there is a way of writing all the known sounds of all the studied languages (the IPA, which Wikipedia uses), and it's pretty rare these days that a "new" sound is found.