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regulator first stage /ɹɪfjˈuːlɪŋ dɪvˈaɪs/ n

中文：一级减压器

中文 · 一级减压器Español · regulador de la 1ª etapa de descompresiónFrançais · détendeur premier étage
Meaning：Apparatus attached to the cylinder valve that lowers the air pressure coming from the cylinder to an intermediate value (medium pressure).
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