1·它们是1431年以前经过六个世纪才建成的。
They had been built over a period of six centuries up till 1431.
2·泰国人较易地取得了胜利，他们终于在1431年洗劫了吴哥。
The Thais had a relatively easy victory when they finally sacked1 Angkor in 1431.
3·泰国人较易地取得了胜利，他们终于在1431年洗劫了吴哥。
The Thais had a relatively easy victory when they finally sacked4 Angkor in 1431.
4·1431年，十岁的英格兰国王亨利六世从伦敦前往巴黎，巴黎圣母院加冕他为法兰西国王。
Then, in 1431, aten-year old king of England, Henry VI, travelled from London to Paristo be crowned king of France in Notre Dame cathedral.
5·1431年，年仅10岁的英国国王亨利六世，从伦敦远赴巴黎，在巴黎圣母院加冕为法国国王。
Then, in 1431, a ten-year old king of England, Henry VI, travelled from London to Paris to be crowned king of France in Notre Dame cathedral.