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在海拔3000米以上高原地区，采用常规方法种植蔬菜，可能利用季节不多。如果采用一种地下式的温室建筑物，便可常年种植蔬菜。这种地下温室，设计简单，材料不贵。建筑方法：挖一个2米深、2．5米宽、6米长的坑，在坑的一端筑一个带门的墙，从地面往下到门挖几层台阶。在该坑的?
In the altitude of 3000 meters above the plateau, the use of conventional methods of planting vegetables, may use less season. If you use an underground greenhouse buildings, you can grow vegetables all year round. This underground greenhouse, simple design, the material is not expensive. Construction Method: Dig a pit of 2 meters deep, 2.5 meters wide and 6 meters long. Build a wall with a door at one end of the pit. From the ground down to the door, dig a few steps. In the pit?