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- 那户人家真是祸不单行，他们本来就穷，现在他们的父亲又生了病。
The family is doubly troubled; they have no money and now their father is ill.
- 不单他一个人认为那会引起战争。
He is not alone in believing (ie Other people agree with him) that it may lead to war.
- 不单是树叶，连个虫子都不动。
Not a leaf nor an insect stirred.
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