John Hildebrand: the animals had decreased the pitch of their songs by about 30% from the 1960s to today.
约翰·希尔·德布兰：从上世纪60年代至今，这种动物已经将他们歌声的音高降低了大约30%。
These songs were about country life, the seasons, animals.
这些歌是关于乡村的生活，季节。
These songs were about country life, the seasons, animals and plants, and about love and sadness in people's lives.
歌词内容是有关乡村生活、季节、动植物以及人的生活中的爱情与忧伤。
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