4 If degenerative change is a shaky explanation for our decreased robustness, it is even less persuasive as an explanation for a decrease in our intellectual powers.
4 If degenerative change is a shaky explanation for our decreased robustness, it is even less persuasive as an explanation for a decrease in our intellectual powers.
如果退行性变化对我们的壮实/皮实程度下降来说欠说服力的话，那么对我们智力降低的说法就更站不住脚了。