The numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years.

在最近的20年到30年的时间里，某些种类的鲨鱼的数量已经下降了90%。 ！

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Wang said in the last 20 to 30 years, what it means to be Asian in Southern California has changed.

王说在过去二三十年间，南加州的亚洲人已经不同了。

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In the middle to high latitudes rainfall has risen steadily over the last 20-30 years.

中高纬度地区的降雨量在过去的20到30年间稳步上升了。

《柯林斯英汉双解大词典》

The number of alcohol-related deaths among women aged 30 to 44 has doubled in the last 20 years, although numbers remain relatively small (70 deaths in 2010), according to statistics from the General Register Office for Scotland.

CNN: 'Drinking Mirror' app aims to show how alcohol ages you

"In the last three to four years our companies in Asia have been seeing a 20% to 30% average annual growth, reflecting the growth of the economies there, " says Dave Byers, head of ESRI, Asia-Pacific Region.

FORBES: Map Mania

The NFMFT estimates that the number of local butchers has fallen from 30, 000 to just 6, 000 in the last 20 years.

BBC: Horsemeat scandal: Good news for butchers?