The palace buildings, primarily made of wood, were vulnerable to lightning strikes(雷击) and the open flames used for lighting and heating.
To combat the risk of fire, hundreds of metal vats were placed around the palace to collect water and early lightning conductors(避雷针) were built onto higher roofs. Still, there were regularfires, as well as earthquakes, over the centuries. As a result, almost all of the buildings of the Forbidden City are later reconstructions of the originals.
primary adj. 主要的；初级的；基本的
be vulnerable to 易受攻击的；易受伤害的
(weak and easily hurt physically or emotionally )
Combat v. 与..战斗 防止；减轻不好的状况
Combat the coronavirus pandemic (瘟疫)
Combat crime/terrorism/inflation 打击犯罪/恐怖主义/拟制通货膨胀
The combat between good and evil 善于恶的较量
Vat 大桶；大缸 也可以做量词
A vat of wine/oil 一桶酒/油
避雷针：因为避雷针可以把云层上的电荷导入地下，从而保护建筑不被雷击，因此得名
The post-war reconstruction of Germany. 战后德国重建
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