阶梯式倍投法怎么样简介：The yellow-painted bus creaked down the ramp on West Street, covered with a layer of white snow. She was waiting for the moment the bus opened the door with a creak, then jumped on the bus and said a silent farewell to someone. .
The yellow-painted bus creaked down the ramp on West Street, covered with a layer of white snow. She was waiting for the moment the bus opened the door with a creak, then jumped on the bus and said a silent farewell to someone. .
