millionfold

adjective [原级]百万倍的

The stem cells themselves are extracted from cattle muscle and then multiplied a millionfold before they are put in Petri dishes and allowed to turn into muscle cells.
那些干细胞从牛肌肉中提取，在放入培养皿和变成肌细胞之前，干细胞还要经过上百万次繁殖。