bǐ / sài / kāi / shǐ / qián / jiào / liàn / xiàng / suǒ / yǒu / jìng / sài / zhě / shuō / míng / le / guī / zé

比赛开始前，教练向所有竞赛者说明了规则。

Before the competition began, the coach explained the rules to all the contestants.