Assertion: tuba's valve | /r/HasProperty | depressed
Facets:
value: in combination with another one
type: OTHER
Source sentences:
text: For example, a BB♭ tuba becomes (in effect) an A♭ tuba when the first valve is depressed.
text: When the third (or fourth) valve is depressed in combination with another one, the air is routed through both the usual set of tubing plus the extra one, so that the pitch is lowered by an appropriate amount.