It is surprisingly difficult to catch this disease, even though the majority of people are born with natural immunity.
大多数人天生具有自然免疫力,但这种疾病却出人意料地难以感染。
He helped the poor and rescued those in danger.
他济贫并救人于危难.
The project was a bold one , full of difficulty, perhaps impracticable.
这个救人的打算是很冒险的, 是有困难的, 看来也是行不通的.
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