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海城县孤山公社瓦子沟大队,于1969年在丹东市蚕科所的协助下修建了一座双间钢筋水泥平盖式半地下恒温保种室(见图)。四年来的实践证明,用这种保种室保种效果良好。
Haicheng County Gushan commune Wazhou ditch brigade, in 1969 in Dandong City, with the assistance of the Branch of a double-reinforced concrete flat cover semi-underground temperature preservation room (see photo). Four years of practice has proved that the preservation of seedlings with this kind of effect is good.