The salt was used to preserve meat which began to be traded in large quantities in the late stone age.

在当时的晚石器时代，盐被用作保存肉食，并拿这些肉食做大量交易。

We know about two methods that were used for removing ink from parchment in the late middle ages.

我们知道中世纪晚期用于从羊皮纸上去除墨水的两种方法。

And thus, we must live not as if we are one of the ones who will live into late age, but rather, one of the ones who might not.

因此，我们不能像那些将活到长寿的人一样生活，而应该像那些可能活不到长寿的人一样生活。

That's why there's an increased risk of breast cancer with things that increase the number of menstrual cycles - like early age of menarche, which is the first menstrual bleeding, and late age of menopause.

这就解释了为什么月经次数较多的人患乳腺癌的几率更高，如初潮过早或停经过晚者。

King Arthur as we know him is a creation of the later Middle Ages, but his legend actually has its roots in Celtic poetry from an earlier time: the Saxon invasions of Britain.

我们所知道的亚瑟王是中世纪后期的创造，但他的传说实际上源于更早时期的凯尔特诗歌：撒克逊人入侵不列颠。

She is usually " cited, " that is, she is usually produced as evidence of how it is possible to start at something at a late age – at an older age, and still be good at that thing.

她通常被“引用”，也就是说，她通常是作为证据证明在晚年开始做某事是可能的——在年长的时候， 仍然擅长那件事。