| 单词 | flap-valve |
| 释义 | > as lemmasflap-valve flap-valve n. ΚΠ 1867 W. W. Smyth Treat. Coal & Coal-mining 211 The chambers are fitted..with flap valves. 1874 E. H. Knight Pract. Dict. Mech. I. 876/2 Flap-valve, a valve which opens and shuts upon one hinged side. A clack-valve. < as lemmas |
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