单词	domain of study
释义	domain of study 研究域
随便看	original new drug original node chain original non-being original notion original nucleus original number original object original-object program original observation original observation equation original observed variable Original Obtainment of Ownership of Ship original offender original offer original of the contract original of the treaty original oil-gas ratio original oil in place original oil in-place original oil in-place, OOIP original oil saturation original oil volume factor original oil-water contact original open cover original or authentic clause