When he studied math and science at Oxford University, he became seriously ill, which made him unable to speak or breathe without the help of machines.
当他在牛津大学学习数学和科学时，他得了重病，这使他不能说话，没有机器的帮助就不能呼吸。
He has been ill for about one month, which made him miss a lot of classes.
他病了一个月左右，这使他在学习上耽误了很多。
He was ill for about a month, which made him lose a lot of time at study.
他病了一个月左右，这使他在学习上耽误了很多。
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