Combined with the period's poor sanitation standards, the oppressive heat made the city a breeding ground for bacteria like cholera.

加上该时期恶劣的卫生条件，酷热使这座城市成为霍乱等细菌的温床。

Combined with the period’s poor sanitation standards, the oppressive heat made the city a breeding ground for bacteria like cholera.

再加上那个时期糟糕的卫生标准，酷热使这座城市成为霍乱等细菌的滋生地。