When I began recording over four decades ago, I could record for 10 hours and capture one hour of usable material, good enough for an album or a film soundtrack or a museum installation.
40 多年前当我开始录音时， 每录制 10 小时音景 就能截取到 1 小时可用的材料， 并可用于唱片或电影原声 或博物馆陈列安置中