短語詞組短語existence restraint condition 存在約束條件existence condition of crank 曲柄存在條件crank existence condition 曲柄存在條件Students Existence Condition 學(xué)生生存狀態(tài)natural existence condition 本真存在狀態(tài)existence condition of the solution 解的存在條件condition existence 生存條件condition of existence 生存條件;賦存條件 返回 existence condition