大半を占める

油潤滑では大半を占める
[abura junkatsu de wa taihan o shimeru]

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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

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×　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

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References:

①　www.machinerylubrication.com
②　www.skf.com
③　trans.glova.jp/
④　www.csse.monash.edu.au

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