The custom of choosing a sweetheart on this date spread through Europe in the Middle Ages, and then to the earlyAmerican 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。
2
They hope that the technology will be cleared for use in American courts by early next year.
他们希望这项技术明年初能应用到美国法庭上。
3
The rocky views glimpsed by the Nearer Nine and other Russian landers suggested a tortured volcanic history that was confirmed in the early 1990s by the American Magellan orbiter.