Wood: hardwood, softwood, saw timber, preserving timber, etc.
木材区：硬木、软木、锯木、防腐木等。
Iceboxes made of wood were widely used in the Qing royal court. Due to the weak conductivity of heat, lead or tin was put inside the box to extend the hours for preserving the natural ice.
清代宫廷已经普遍使用木制“冰箱”，其采用导热性较弱的铅或锡为里，以延长天然冰的使用时间。
Iceboxes made of wood were widely used in the Qing royal court. Due to the weak conductivity of heat, lead or tin was put inside the box to extend the hours for preserving the natural ice.
清代宫廷已经普遍使用木制“冰箱”，其采用导热性较弱的铅或锡为里，以延长天然冰的使用时间。
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