People from different linguistic groups and cultures need to communicate with each other, and they must find communication tools. At one level, they can rely on specially trained professionals who can speak and interpret more than two languages. But this is inconvenient, and the time and cost spent are expensive. Therefore, throughout the history, the common language has been constantly appearing, Latin in the ancient and medieval world, French in the West for centuries, and in Africa Many areas are Swahili and in the second half of the 20th century English was spoken in most parts of the world. What does this text mean? ['The limitations of translation as a communication tool are obvious.', 'The common language is an effective way to deal with language differences.', 'Communication tools change with the needs of the times and levels.', 'Humans have long searched for a common language.']