[abura junkatsu de wa taihan o shimeru]
Definitions:
油 【あぶら】 oil
潤滑 【じゅんかつ】 lubrication
大半 【たいはん】 majority; mostly; generally
占める 【しめる】 to comprise; to account for
× occupies the majority in oil lubrication
◎ Constitutes the majority of friction under oil-lubricant conditions
◎ in oil lubricated conditions
◎ of lubricating conditions
☆ predominant under oil lubrication
References:
① www.machinerylubrication.com
② www.skf.com
③ trans.glova.jp/
④ www.csse.monash.edu.au

Japanese-English Glossary for Engineers
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