单词	sulfide stains
释义	sulfide stains n.硫化物污斑
随便看	Operational Readiness Training Equipment operational readiness training program Operational Readiness Training Team Operational Readiness Unit operational reconnaissance operational record operational recording operational recording level operational records operational reentry systems evaluation program operational reference model operational regime operational region operational register operational regulations operational relay operational reliabihty operational reliability operational report Operational Reporting Operational Reporting System Operational Reports Control Operational Reports Lessons Learned Operational Reports Section operational requirement