If it is not found, then the nearest matching combination present on the system is used.

如果未找到，则使用系统上存在的最接近的匹配组合。

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If it does match, a mapping will be instantiated for each matching combination of values, and the transformation will be propagated to child elements.

如果符合，对每一个符合的值的组合都会有一个映射被例化，然后转换将被传播到子元素。

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Due to the handling of default Boolean combinations for filler terms, the matching focuses on non-filler terms if there is a combination of filler and non-filler terms in a search.

由于辅助词会与默认的逻辑值组合，所以如果搜索中包含了辅助词和非辅助词，那么这时匹配只关注于非辅助词。

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Mrs Berger, 61, from from Harrow, north-west London, suffers from myelodysplastic syndrome and has a combination of rare tissue types, making finding a matching donor more difficult.

BBC: Caroline and Sharon Berger

Mrs Berger, from Harrow, north-west London, has a combination of rare tissue types that has made finding a matching donor more difficult.

BBC: Urgent plea for bone marrow donor