The word "movement" contains a "cloud" in both words, and, "cloud" begins to "go" is "yun", "cloud" and "force" next to "moving". "" is The natural state of the clouds, so sing "A cloud drifting across the sky of the hometown"; the clouds have been "moving", and to a certain extent, they burst out of "power", even if this second is sunny, the next Heavy rain. Such an explanation is sure to laugh and be generous, but "sports" can indeed accumulate strength. "Exercise for one hour a day, work for fifty years of health, and live a happy life". The three relationships are progressive and causal. What does this text mainly express? ['Sports nouns explained.', 'Significance and role of sports.', 'Sport is so full of charm.', 'The relationship between exercise, health, and happiness.']