| 单词 | water key |
| 释义 | water key water key n.（名词）A lever covering a small hole on certain brass instruments, such as the trombone, that is pressed to drain saliva that has accumulated in the instrument.乐器排水口：盖住诸如长号等某些铜管乐器上小孔的杆状物，可以压下，以排出乐器中积下的口水 |
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