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在砌筑灶台时,锯一长度略长于灶宽、直径约11厘米的竹筒,去尽内节,埋于灶底距火底约15厘米处。一到冬天
When building a stove, saw a bamboo tube that is slightly longer than the stove width and has a diameter of about 11 centimeters. The inner section is buried and buried about 15 centimeters from the bottom of the fire. One winter