When Zhang Heng, the Chinese astronomer and geographer, wanted to draw a map of the heavens, he wasn't satisfied with a simple paper map.
当中国天文学家和地理学家张衡想画一幅天体地图时，他对简单的纸制地图并不满意。
When Zhang Heng, the Chinese astronomer and geographer, wanted to draw a map of the heavens, he was not satisfied with a simple paper map.
当中国的天文学家、地理学家张衡想画一副天体图时，他并不满足于仅仅画一张简单的纸质地图。
When Zhang Heng, the Chinese astronomer and geographer, wanted to draw a map of the heavens, he was not satisfied with a simple paper map.
当中国的天文学家、地理学家张衡想画一副天体图时，他并不满足于仅仅画一张简单的纸质地图。
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