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it is generally believed that swimming is one of the best wa

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it is generally believed that swimming is one of the best ways for a person to___good health ...
it is generally believed that swimming is one of the best ways for a person to___good health A sustain B maintain搞不清他俩区别
maintain --keep sth. in existence at the same level, standard. 维持(已有的水平、标准);
sustain --keep sb./sth.alive or in existence(支持、维持生命), to keep up the strength, spirits or determination of (维持体力/精神/决心).
只有在维持体力的时候两者可以通用.其他时候他们在意思上并不重合.对于这道题,保持身体健康,应该是保持现有的健康水平,所以应该是maintain.
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