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1·He received a car on his fifteenth birthday.

他在十五岁生日时收到了一辆车。

2·The number of extant manuscripts, however few, really does not allow scholars to infer how many ancient Latin manuscripts of a work survived to the ninth, the twelfth, or even the fifteenth century.

现存的手稿，不论数量多么少，也不能让学者推断一部作品的古代拉丁手稿有多少存活到了九、十二，甚至是十五世纪。

3·He got two birthday cakes on his fifteenth birthday.

他十五岁生日时得到了两个生日蛋糕。

4·The writer got new potatoes on the fifteenth day of the experiment.

作者在实验的第十五天获得了新土豆。

5·The fifteenth century saw big progress in printing technology in the west.

15世纪西方印刷术有了很大进步。

6·It is on the fifteenth day of the eighth month in the Chinese lunar calendar (阴历) .

它是在中国农历的八月十五日。

7·In the fourteenth and fifteenth centuries, more and more land was for college buildings.

在14和15世纪，越来越多的土地被用作大学建筑。

8·They can push down the thirteenth partial and bring up the fifteenth and thereby change the sound of a clarinet into a French horn.

他们可以压低第十三分音，或者提高第十五分音，从而将单簧管的声音变成圆号的。

9·But up to the fifteenth century, the lead strips also helped create the design—they were worked into the window as part of the composition.

但是直到15世纪，铅条也在创新设计中发挥了作用，到这时它才被放到窗户里，作为设计的一部分。

10·The earliest ceramics were fired to earthenware temperatures, but as early as the fifteenth century B.C., high-temperature stonewares were being made with glazed surfaces.

最早的陶瓷制品是在制陶的温度下烧制的，但是早在公元前15世纪，（人们）已经用高温烧制表面上釉的炻器。