second sound的用法和樣例：
例句
- As the second bell rang in the hallway, I ran to the door of the classroom.
走廊響起第二聲鐘響時(shí)，我才跑到教室門(mén)口。 - A second long whistle shall bring the backstroke and medley relay swimmer immediately to the starting position.
總裁判應用第二聲長(cháng)哨示意仰泳或混合泳接力的仰泳運動(dòng)員立即就位。
