start of a run

例句：

1. 1. The race started at7:00 AM sharp.
   比赛在早上7点准时开始。
2. 2. Themarathon is the start ofthe season's events.
   马拉松是赛季活动的开始。
3. 3. Theconcert was the start ofa long weekend.
   音乐会是长周末的开始。