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Since ancient times, people like to express their feelings by singing, which is either unilateral or between the two sides. This kind of singing is really subtle when I think of it. Unlike ordinary language, it needs proper atmosphere and proper handling, and it should take into account certain consequences; It can come out of thin air, swim gracefully, blink, suddenly far and near, specious; It's like the tentacles of the mood, testing each other, looking at each other, or retreating at the touch, or pestering each other.