One with eight petals is part of the fourfold category, and so on.

八片花瓣也属于四重对称，以此推。

That was nearly a fourfold increase on a similar survey conducted in 2013.

和2013年进行查相比，该比例上涨了近4倍。

Well, you notice that, in fact, that also goes up roughly three- to fourfold.

我们可以看到人口数也翻了三到四番。

The world population increased fourfold in the last century, so what can we expect for the next century?

界人口在过去一个纪里增加了四倍，那么，下个纪会怎么样？

For the appetite Mammy had always deplored, the healthy appetite of a nineteen-year-old girl, now was increased fourfold by the hard and unremitting labor she had never known before.

关于食欲，嬷嬷是很替她伤心，为一个１９岁姑娘正常食欲，由于她从未听说过持续不停艰苦劳动而增加了四倍。

Marrying later From 1950 to 1990, the number of young single women across Asia increased almost fourfold, from 22 million to 82 million.

结婚更晚从 1950 年到 1990 年，亚洲年轻单身女性数量增加了近三倍，从 2200 万增加到 8200 万。

Since its inception in 2000, total African exports utilizing its benefits have increased fourfold, and the U.S. is committed to building on this growth by extending the program for another 15 years.

自该项目2000年启动以来，从中获益整个非洲出口量翻了四倍，美国致力于在未来15年内扩展该项目，在此基础上再接再厉。