His sickness is mainly due to exhaustion. (exhaustion 最恰当)
His disease was mainly due to over exertion caused by. --此句语法明显错误
over exertion:过于努力(用力过度,太费力)不太恰当,劳累不等于努力.
His sickness is mainly as a result of tired excessively causes.
小妹妹或小弟弟，要选本人哦！偶本人是去经过严密的......反正要选偶啦
His disease was mainly due to over exertion caused by.
小学的，很简单
His illness is mainiy due to tiredness.
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