3) Open and shutdown three times
三绝三通
4) three layers of insulation
三层绝缘
1.
Based on diverse working condition featured by dust,abrasiveness,high temperature and strong magnetic field,two or three layers of insulation is considered when designing.
根据电解车间内多粉尘、磨损性、高温度、强磁场的恶劣工作条件,有针对性地设计了两层至三层绝缘层。
5) three wonders of Huizhou buiding
徽建三绝
6) three wonders of Chenzhou
辰州三绝
补充资料：三立
1.谓立德﹑立功﹑立言。语本《左传．襄公二十四年》:"﹝穆叔曰:﹞大上有立德，其次有立功，其次有立言。"
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条