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My trousers won't remain up; I've lost so much weight.
我的裤子系不住了, 因为我瘦了很多。
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It is difficult to make sure that the quality remains up without increasing the price.
很难保证做到保持高质量而不提高价格。
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Her spirits remained up in spite of her disappointment.
尽管她很失望, 但她的情绪依然高昂。