With the rising of dense and cold high buildings in the city, happiness is being broken into pieces and drifting away in the congested traffic and the foul air.
随着城市里那些密集而冰冷的高楼大厦拔地而起，在拥堵的车流中，在污浊的空气里，人们的幸福正在一点点地破碎，飘零。
Warm air is less dense than cooler air so it ends up layered on top of the downward moving cooler air.
热空气比冷空气密度小，因此热空气总在冷空气上方。
As the dense, cold high-rises sprout up in the cities, the traffic congests, the air fouls, and bit by bit, people's happiness is tattering and dying away.
随着城市里那些密集而冰冷的高楼大厦拔地而起，在拥堵的车流中，在污浊的空气里，人们的幸福正在一点点地破碎，飘零。
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