求翻译：Generation of poly-b-hydroxybutyrate from externally provided acetate是什么意思？

聚β-羟基丁酸酯的生成，从外部提供的醋酸

新一代的聚脂b-羟丁酸从外部提供醋酸盐

世代的多b hydroxybutyrate从外在地提供的醋酸盐

保利-b-羟基丁酸从外部提供的醋酸的一代

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