The sounds they're describing and the ones you're currently hearing, the " chips, " " cheeps, " " zeeps, " " whistles" and " trills, " —these are the sounds of birds migrating at night.
乔布斯:他们描述的声音和你现听到的声音,“吱吱声”、“吱吱声”、“吱吱声”、“口哨声”和“颤音”——这些都是鸟类夜间迁徙的声音。