Can you imagine going to the gym four times a week and doing the same workout with the same weight for the same muscle group over and over again?
你能想象一周去四次健身房,以同样的重量,做同样的动作,锻炼同一块肌群,如此反复么?
The same way cells that form the limb become more like muscle cells or skin cells, or the structures that become the limb.
同样的,形成上肢的细胞,变得越来越像肌肉或皮肤细胞,或者上肢的其他结构
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