translation.en: When I began recording in the late '60s, the typical methods of recording were limited to the fragmented capture of individual species like birds mostly, in the beginning, but later animals like mammals and amphibians.
translation.zh: 60年代后期当我开始录音时， 典型的录音方法受到限制， 只可捕捉个别物种片断的声音， 开始时主要是鸟声， 但后来包括了哺乳动物和两栖动物