例句與造句

1. The alphorn's exact origins remain indeterminate, and the ubiquity of horn-like signal instruments in valleys throughout Europe may indicate a long history of cross influences regarding their construction and usage.
2. 17th 19th century collections of alpine myths and legends suggest that alphorn-like instruments had frequently been used as signal instruments in village communities since medieval times or earlier, sometimes substituting for the lack of church bells.
3. It's difficult to find signal instrument in a sentence. 用signal instrument造句挺難的