比起过去二十年做过的实验来说，这是个重大的进展。
This is a significant advance compared to experiments that have been performed over the past 20 years.
今天比起过去，祖先们有更多基因蓝图可得。
Today the ancestors have more available genetic blueprints than ever.
时刻捕捉最新俚语，比起过去，这项工作更简单也更难了。
Keeping up with the latest slang is at once easier and harder than ever.
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