| 单词 | pressure valve |
| 释义 | > as lemmaspressure valve pressure valve n. ΚΠ 1853 Sci. Amer. 6 Aug. 374/2 Combined with the air pump and pressure valve, for the purpose of regulating and maintaining the intensity of the steam on the saw. 1897 Weekly Sun 19 Sept. 15/2 It is forced down by the tremendous pressure-valves into a small chamber within the tank. 1992 S. Sigfusson Sigfusson's Roads x. 72 Air holes were nature's equalizing pressure valves; they formed in the ice, and freighters constantly brooded about them because technically they were weak spots. < as lemmas |
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