单词	upper back
释义	upper back 上背
随便看	valve open valve opening valve-opening diagram valve-opening period valve-opening pressure valve-opening time valve-operated water closet valve operating diagram valve operating gear valve operating mechanism valve operating piston valve-operating stud valve operation mechanism valve operation test valve operator valve operator adapter valve orifice valve oscillator valve-out valve outer chamber valve outer chamber cover valve outer spring valve outlet Mach number valve overlap valve-overlap 輁輂較輄輅輆輇輈載輊えん【炎】えん【焉】えん【煙】えん【猿】えん【縁】えん【艶】えん【遠】えん【鉛】えんいんえんいん