情報検索の効率を測る尺度として、再現率と適合率というものがある。

、。

Among the measures used to gauge the effectiveness of information retrieval are things called recall and precision.

Literal

Information-retrieval [attributive-の] efficiency [object-を] measure scale [as-として], recall [and-と] precision [called-という] thing [subject-が] exists.

A definitional sentence from information science. 情報検索 ('information retrieval') is the computing/library-science technical term. 尺度 ('scale, measure') is used for abstract quantitative measures. ~として ('as') marks the role something plays. 再現率 ('recall,' literally 'reproduction rate') and 適合率 ('precision,' literally 'fitness rate') are the standard Japanese IR terms, calqued from English. ~というもの marks the pair as 'things called.'