c. 1300 (implied in pertly), "evident, unconcealed," shortened form of Middle English apert "open, frank," from Old French apert, from Latin apertus, past participle of aperire "to open" (see overt). Sense of "saucy, bold" first recorded late 14c. Less pejorative meaning "lively, brisk, in good spirits" (c. 1500) survives in U.S. dialectal peart (with Middle English alternative spelling). Related: Pertness.
例文
1. Because of these differences, PERT isused more in research and development projects.
これらの違いを考慮して、 PERT は主に研究開発プロジェクトに応用されている。
2.All these methods make the PERT more powerful in highway construction management.