锻炼有助于使你的身体足够强壮，以抵抗病毒。
Exercises will help make your body strong enough to resist (抵抗) the virus.
同样，如果一种植物或动物没有留下任何可以繁殖的后代，它就不能把所有的能量浪费在使自己变得更强壮上，因为这是最可能走向灭绝的方式。
Similarly, a plant or animal cannot squander all its energy on growing a big body if none would be left over for reproduction, for this is the surest way to extinction.
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