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重点讲解：
1. die from 死于；
It's reported that every year millions of people die from illnesses caused by smoking.
据报道，每年有数百万人死于与吸烟有关的疾病。
2. used to do sth. 过去常常；过去曾；
I used to smoke, but I gave up a couple of years ago.
我以前抽烟，但几年前就戒掉了。
3. suffer from (因疾病或处于其他不利境地而)受苦，受难，受折磨；
I still suffer from catarrh and sinus problems.
我仍然患有黏膜炎和鼻窦炎。
4. be resistant to 有抵抗力的；不受…损害的；
At least one of the NDM-1 infections the researchers analysed was resistant to all known antibiotics.
研究者分析现在至少有一种NDM-1感染对现在已知的所有抗生素都有耐药性。
