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单词可以压下
例句 DEFINITIVE EXAMPLES 权威例句〔water key〕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美国传统
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