就像其它系统一样，这个系统是高度易变的（有些人的生理系统很虚弱，有些人的很强健），而且随着年龄的增长，这种理能会逐渐被耗尽、变的虚弱。
Like any other system, it is highly variable (some people have weak systems, some people have strong systems), and it wears out and gets more fragile with age.
就像其它系统一样，这个系统是高度易变的（有些人的生理系统很虚弱，有些人的很强健），而且随着年龄的增长，这种理能会逐渐被耗尽、变的虚弱。
Like any other system, it is highly variable (some people have weak systems, some people have strong systems), and it wears out and gets more fragile with age.
应用推荐