一千五百多年前。
Forty years ago, the nuns numbered nearly a hundred; fifteen years ago there were not more than twenty-eight of them.
四十年前，修女的人数几乎到一百，十五年前，只有二十八个人了。
Fifteen-hundred years ago, people from the central Amazon area in South America made a sort of charcoal by heating tree bark and animal bones without air.
1500年前，生活在南美洲亚马逊丛林深处的人们发明了一种通过在没有空气的条件下加热树皮和动物尸骨制造碳的方法。
Fifteen-hundred years ago, people from the central Amazon area in South America made a sort of charcoal by heating tree bark and animal bones without air.
1500年前，生活在南美洲亚马逊丛林深处的人们发明了一种通过在没有空气的条件下加热树皮和动物尸骨制造碳的方法。
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