以下为句子列表：
英文: Bernstein has first-hand knowledge of both booms and busts: His grandfather's leather factory became a growth business in the 1920s when the exploding popularity of the automobile created huge demand for sponges and chamois-skin polishing cloths.
中文: 伯恩斯坦有繁荣和萧条的第一手知识:他祖父的皮革工厂在1920年代成为一项增长的业务,那时汽车的普及创造出对皮革服装的巨大需求.
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