n. (baseball) a pitch thrown with maximum velocity
n. [棒](投手投出的)快球
1. The pitcher threw a fastball that surprised the batter.
投手投出了一个快速球，让击球手感到意外。
2. He is known for his powerful fastball and can strike out many hitters.
他以强力快速球而闻名，能击倒许多击球手。
3. During the game, the coach called for a fastball to get the final out.
比赛中，教练要求投一个快速球来结束这一局。