传令官吹响号角宣布游行开始。

The herald blew the ___clarion to announce the procession.

清晨，嘹亮的号角声宣告着比赛的开始。

The ___clarion sound of the trumpet announced the start of the race.

他发出了一个响亮而清晰的号召，呼吁大家保护环境。

He made a ___clarion call for everyone to protect the environment.