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在没有电光照明的野外普查队中,复制各种瓦特曼纸或米厘方格纸的原图可利用日光进行。其透视的亮度能达到不低于室内的电光透图台。
In electro-nomadic field census teams, copies of various Watman paper or meter cellophane paper can be made with sunlight. The perspective of its brightness can reach no less than the indoor electro-optical map Taiwan.