It's certainly easy to say when not to use one: when the incremental benefit over XML 1.0 is small, or the route to preserving your data in XML 1.0 is fragile or lossy.
说不使用要更容易一些：如果与XML 1.0相比带来的受益很小，或者把数据保存到XML 1.0的方法很脆弱或者容易丢失，那么就不使用。
Although albuterol, but not the two placebo interventions, improved FEV1 in these patients with asthma, albuterol provided no incremental benefit with respect to the self-reported outcomes.
结论在这些哮喘病人中，尽管沙丁胺醇(而不是两种安慰剂干预)可改善FEV1，但沙丁胺醇在自我报告的转归方面没有提供额外的益处。
Economic value of water resources refers to incremental benefit, measured with currency, brought by unit natural water (raw water without processing as for commodity) to economic and social users.
水资源经济价值：每单位原水给经济社会使用者带来的、以现行货币衡量的利益增值。
Economic value of water resources refers to incremental benefit, measured with currency, brought by unit natural water (raw water without processing as for commodity) to economic and social users.
水资源经济价值：每单位原水给经济社会使用者带来的、以现行货币衡量的利益增值。
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