an operation that determines whether one or more of a set of items has a specified property
同义词：search, lookup
动词 look-up:
seek information from
同义词：consult, refer, look up
look-up详细解释
look-up n.Computer Science （名词）【计算机科学】 A procedure in which a table of values stored in a computer is searched until a specified value is found.查表：将计算机内储存的数值表查找一遍直至找到某个值的过程
