要表达“看那只长颈鹿”,你应该说;()
Can you see a vase and two heads? ____
点O是△ABC所在平面内一定点,动点P满足OP→=OA→+λ(AB→|AB→|·sinB+AC→|AC→|·sinC),则动点P的轨迹一定通过三角形ABC的( )