单词	backward dive
释义	backward dive noun : a dive in fancy diving from a position facing the board and keeping the back toward the water throughout compare cutaway Word History First Known Use 1949, in the meaning defined above
随便看	optimizer optimizers optimizes optimizing optimum optimums opting opting (for) opting for opting in opting out option option to buy optional optional pass optional referendum optional writ optionalities optionality optionalize optionally optionals optionary optioned optionees

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