传令官吹响号角宣布游行开始。
The herald blew the ___clarion to announce the procession.
士兵们吹响号角，宣告战斗的开始。
The soldiers blew the ___clarions to signal the start of the battle.
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.
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