English translation for "freeing pipe"

出气管
油气逸出管

Example Sentences:

In addition , free pipe organ recitals are held at the concert hall on selected saturday afternoons . hong kong cultural centre arts and crafts fair - performance programmes are also held at piazza area c on selected sunday ( & public holiday ) afternoons
为推广中国传统艺术及发扬中华文化的姿采，本中心在每月首个周四周六，特别编排富中国特色的大堂免费节目，万勿错过！

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