A:日月升落
B:极昼极夜
C:月相变化
D:四季转换
已知两点F1(-1,0)、F2(1,0),且F1F2是PF1与PF2的等差中项,则动点P的轨迹方程是( )
— Leonardo didn't win an Oscar __________ he acted in The Revenant《荒野猎人》.
— Yeah. It was hard for him to realize this dream, but he never gave up.