A:She is in the living room.
B:She is in the bathroom.
坐如钟,站如松。长期不合理的坐立姿势会引起脊柱异常弯曲。这说明习惯影响( )
213 =____÷____ 1415 =____÷____
913 =____÷____ 415 =____÷____