数个世纪以来，天花对于人类来说是一种最可怕的致命性疾病，其历史可追朔到3500年前。
Over the centuries, smallpox has been one of mankind's most feared and deadly diseases with a history dating back at least 3500 years.
但对我们来说这很令人激动，因为它揭示了这个遗址最早的建筑层，可追朔到3000年前。
But it is really exciting to us, because it reveals the earliest construction layers of the site, dating to about 3, 000 years ago.
但对我们来说这很令人激动，因为它揭示了这个遗址最早的建筑层，可追朔到3000年前。
But it is really exciting to us, because it reveals the earliest construction layers of the site, dating to about 3,000 years ago.
在世界上的每个角落，某些城市居民过多地承受健康不良造成的痛苦，而这些不公平现象可追朔到他们在社会和生活条件方面的差异。
In every corner of the world, certain city dwellers suffer disproportionately from poor health, and these inequities can be traced back to differences in their social and living conditions.
现代的气候记录可以追朔到1850年。
两国间的友好关系可以追朔到许多年以前。
The two countries are linked by bonds of friendship going back many years.
漳浦剪纸的历史源远流长，可以追朔到唐宋时期。
Paper-cutting in Zhangpu has a long history, which can date back to the ancient time(the Tang and Song Dynasties).
水汽的源地可以追朔到相当远 ，主要来自西太平洋副热带高压南部低纬热带地区和印度洋洋面。
The water source comes from the low latitude south of the subtropical high over the west Pacific and the Indian Ocean.
水汽的源地可以追朔到相当远 ，主要来自西太平洋副热带高压南部低纬热带地区和印度洋洋面。
The water source comes from the low latitude south of the subtropical high over the west Pacific and the Indian Ocean.
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