Picture 7: The old blockhouses located in the Hexinba Village of Sanlong Township of Maoxian County mostly have walls that feature large contractures and fish ridge-shaped supportive structures.

• 图七：茂县三龙乡高半山的河心坝村老碉房，墙体普遍收分较大、外墙修砌“鱼脊背”凸棱支撑墙体。