When you remove the environmental variance, the genetic variance remains.
即使完全排除环境的影响，基因的力量依然存在。
Thus, the fact that twins grow up in the same house and experience the same environmental risk factors, does not contribute by itself to the variance in susceptibility to asthma.
因此，事实真相是在同一住宅内长大的双胞胎经历相同的环境有害因素，而这本身不会促使他们对哮喘的易感性发生变化。
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