(Therefore)Because，doing sport can help us strength our resistance to illness.
It is because that doing sport can enhance our immune systems.
两帆顷者种态薯翻译，上面的是直译，下面的是意译乎桐。
Because exercise helps to strengthen our immunity.
Because exercise can increase our resistance.
Because exercise can make our immune system strong
Beacuse doing sports can strengthen the resistance.
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