Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

The Flugelhorn

法兰管

The flugelhorn is a valved bugle developed in Germany. It has a conical bore. The bugle had no valves and therefore could produce only the natural harmonics of the tube. The design pitch was was typically middle C or B-flat. The flugelhorn has a mellower sound than the trumpet.

法兰管是一种在德国开发的带阀号角。它具有圆柱形管身。早期的号角没有阀门，因此只能发出管体的自然泛音。设计音调通常为中音C或B调。法兰管的音色比小号更柔和。
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