Assertion: trombone's tubing | /r/HasProperty | activated by trigger
Facets:
Source sentences:
text: Additional tubing activated by a trigger is the key difference between an ordinary trombone and a trigger trombone.
text: The extra tubing on the C trombone is activated with a trigger to turn it into a standard B flat trombone.
text: On a triggered jazz trombone, the portion of tubing activated by the trigger also has its own tuning slide.