单词	key block
释义	DictionarySeekeystone key block keystone, key block keystone, 1: K 1. The central voussoir of an arch, which is often embellished; until the keystone is in place, no true arch action takes
随便看	universal local loop universal location framework universally universally attracting object universally recognized as nondiabetic universally repelling object universally unique identifier universally unique lexicographically sortable identifier universal machine universal machinenpistole universal magazine code universal mail system universal maintenance training system universal male suffrage universal man universal management agent universal marc format universal market integrity rules universal matched filter universal mating service america universal measurement architecture universal measurement architecture data storage universal media disc universal mediation interface universal mercantile exchange, inc.

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