fifteenth

So, initially they came up with four lines and then eventually five and even six, and then they went back to five by the fifteenth century.

那么,他们最初提出的是四条线,但是最终却是五条线,甚至六条线,然后在十五世纪又回到了五条线

When oil paint replaced tempera in the fifteenth century, it helped painters to deal with difficult subjects like the human figure because, unlike tempera, oil can be blended and overpainted.

油画颜料在十五世纪取代蛋彩的时候, 画家开始能够处理一些诸如人像画等困难的题材, 因为不象蛋彩,油画颜料可以混合和覆盖.

It is unacceptable that here, in the country that invented the Internet, we fell to fifteenth in the world in broadband deployment.

令人无法接受的是，在这个发明互联网的国家，我们宽带数量的排名却滑到了世界第十五位。