He was weak from a long illness.
由于长期生病他身体很虚弱。
He was weak from a long illness.
他长期患病后很虚弱。
She was weak from a long illness.
她因长期生病而十分虚弱。
It will take a long period to recover from such an serious illness.
这样严重的病恢复起来需要很长一段时间。
It will take a long period to recover from such an serious illness.
这样严重的病恢复起来需要很长一段时间。
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