security distance
One of 87 counties in Minnesota, United States. County seat: Preston. / One of 93 counties in Nebraska, United States. County seat: Geneva.
plural of Oldknow
(automotive) the amount of space required between two vehicles on a roadway in order to maintain a safe following distance
(mathematics) Describing a generalization of a metric space in which the distance between two distinct points can be zero.
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DiQt（ディクト）
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