The custom of choosing a sweetheart on this date spread through Europe in the Middle Ages, and then to the early American colonies.

中世纪时，在这个日子里选择意中人的习俗传遍了欧洲，然后又传到了早期的美洲殖民地。

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As early as the tenth century, the Chinese traded their ceramics throughout the Middle East and southeast Asia.

VOA: special.2009.09.09

In the Middle Ages and to some extent in the Early Modern period, we live in a theocentric world.

在中世纪甚至是现在早期，我们生活在以上帝为中心的世界里。

耶鲁公开课 - 文学理论导论课程节选

Also, people who come in early maybe should try to sit in the middle part of the classroom, so the latecomers can come in without too much disruption.

还有,来得早的人最好尽量,坐在教室中间的座位,这样就不必站起来给迟到的人让路

耶鲁公开课 - 基础物理课程节选

Meanwhile, Secretary of State Condoleezza Rice is going to the Middle East early in the new year to drum up support from the so-called mainstream states -Jordan, Egypt and Saudi Arabia - for stability in Iraq, Lebanon and the Palestinian Territories.

NPR: Bush and Iraq: A Punctured State of Denial

The imperial city has been a prominent tourist destination since the early Middle Ages, with striking ruins, catacombs and holy sites.

BBC: Easter in Rome

Previous studies have pinpointed the start of middle age as early as 36.

BBC: Middle age begins at 55 years, survey suggests