单词	policy science
释义	policy science noun : a social science dealing with the making of high-level policy (as in a government or business) Word History First Known Use 1950, in the meaning defined above
随便看	stair wire stair-climber stair-climbing stair-stepper staircase staircase curve staircase shell staircases stairfoots stairheads stairlifts stairs stairstep stairsteps stairway stairways stairwell stairwells staithe staithes staiths stakage stake stake a claim stake and bound

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