if our bodies are not strong, our spirit to do things will certainly be quite dull.and at the same time, we are lack of energy (ies) to study.diseases will only attack the weak, but not the strong.

　　如果我们的身体不强壮，我们做事的精神一定会十分迟钝。而且同时，我们也缺少足够的精力来读书。疾病只为侵击体弱的人而不是强壮的人。