translation.en: But when the bacteria grow and double and they're all participating in making these molecules, the molecule -- the extracellular amount of that molecule increases in proportion to cell number.
translation.zh: 随着这些细菌成倍增长, 且全部一起制造这些分子, 这些细胞外分子的含量 随着细胞数量的增加而增加，