People often subconsciously think that feeling lonely means that this human figure is alone. But in fact, people may not feel lonely when they are alone, but may also feel lonely when the crowd is crowded. Because loneliness comes from the connection that people "own" and "desire" The difference between them is a subjective feeling. A person may be surrounded by others, but is unavailable because he desires some kind of connection, and then feels lonely; while being alone is an objective state, which is "only me at this moment A person". What does this text mainly explain? ['Establishing connections is an important way to avoid loneliness.', 'The true psychological mechanism of human loneliness.', 'Loneliness is not necessarily related to being alone.', 'Association between subjective feelings and objective states.']