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单词	Ramsbottom safety valve
释义	Ramsbottom safety valve noun Rams·​bot·​tom safety valve ˈramzˌbätəm- : a safety valve used especially on locomotives in which two valves are pressed down by a single spring attached to a crosspiece prolonged to form a hand lever by which the valves may be eased up to test their adjustment Word History Etymology after John Ramsbottom, 19th century British mechanical engineer
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