In recent years, there has been an extremely active study of amorphous semiconductors.

近几年来，对非晶态半导体的研究极为活跃。

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Clustering is an active study subject in Data Mining. There are many algorithms of clustering that were applied in every field.

聚类分析是数据挖掘领域中一个非常活跃的研究课题，应用于各个领域的聚类算法非常多。

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Therefore people have to study the pest resistance, and insect pests resistance to insecticides is the most active study in this area.

为此，人们不得不进行有害生物抗药性的研究，而害虫抗药性的研究则一直是有害生物抗药性研究中最活跃的领域。

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The study found that happy people are more likely to be socially active,to read,attend religious services and to vote.

VOA: special.2009.02.11

The study found that happy people are more likely to be socially active, read,vote and attend religious services.

VOA: special.2009.03.10

"Compared to the most active group of women." During the study, the average weight of the participants went up by six pounds, or 2.7 kilograms.

VOA: standard.2010.03.30

He did consulting work with the company for a total of 15 days from 2007 to 2009 as part of the analysis of the earlier ACTIVE study, he said.

WSJ: When Computer Games May Keep the Brain Nimble

The ACTIVE study also tested the time it took to do daily activities, like preparing a meal, and performance tests, such as reading price tables to pick the best telephone provider, Dr. Wolinsky said.

WSJ: When Computer Games May Keep the Brain Nimble

It will study chemically active gases.

NPR: Revisiting the Viking Missions to Mars