硬こう球きゅう

noun

hard ball; regulation ball

Used in sports such as baseball or tennis to refer to a ball that is hard or meets official standards, often contrasted with 軟球 (soft ball).

Antonyms: 軟球

• 硬こう球きゅうを使つかった練れん習しゅうは、軟なん球きゅうよりも打だ球きゅうが速はやい。

  Practice with a hard ball produces faster hits than with a soft ball.

• 公こう式しき戦せんでは硬こう球きゅうが使し用ようされる。

  A regulation ball is used in official matches.