Both practice and experimental studies of other scholar prove that proper natural experiment can make people feel more cheerful and healthy than typical air conditioning experiment.
生活实践以及其他学者的研究都证明，适宜的自然环境较常规空调环境更能给人带来愉悦与健康。
The cheerful morning air is being shared by a pair of hares.
一对野兔双双享受着清晨令人愉快的空气。
Nearby, a fox heard the cheerful call and carefully sniffed the air.
在近处，有一只狐狸也听到了这快乐的召唤，她小心翼翼地嗅了嗅空气。
He sees that in every state people may be cheerful; the lambs skip, birds sing and fly joyously, puppies play, the whole air full of careering and rejoicing insects.
他看到每个地方的人们都满怀喜悦，羊儿撒欢，鸟儿欢乐地歌唱、飞翔，孩子们玩耍，空中飞舞着这种忙碌而快乐的昆虫。
Think of the sun, I am flying in the air, overlooking the earth, saw the cheerful fawn, saw the mountains and streams, this is my heart's dream?
想起太阳下，我翱翔在空中，俯瞰大地，看到了欢快的小鹿，看到了山川溪流，这就是我心中的梦吗？
Then, teachers played various interesting games with the children. The children were so happy that songs and laughters filled in the air. The cheerful scene will be deeply impressed on their memory.
之后老师与小朋友一起游戏，欢声笑语弥漫整个操场，快乐的记忆深深印在了每个小朋友的脑海中。
Then, teachers played various interesting games with the children. The children were so happy that songs and laughters filled in the air. The cheerful scene will be deeply impressed on their memory.
之后老师与小朋友一起游戏，欢声笑语弥漫整个操场，快乐的记忆深深印在了每个小朋友的脑海中。
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