Based on previous study on the guided wave propagated in the pipeline, the main of this paper is to do experimental study on damage detection in pipes using ultrasonic guided waves technique.

本文在前人对导波在管道中传播的理论基础上，重点对管道进行了损伤检测的实验研究。

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James Burke of Duke University is one of the authors of a study reviewing previous research on cognitive decline.

杜克大学的詹姆斯·伯克是一项研究的作者之一，该研究回顾了此前有关认知能力下降的研究。

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The only previous study analyzing causality, based on an area in Mexico that had instituted CCTs, supported the traditional view.

在此之前，唯一一项分析因果关系的研究对传统观点表示支持，其基于墨西哥一个设立条件性现金转移支付（CCT）政策的地区。

youdao

James Burke of Duke University is one of the authors of a study reviewing previous research on cognitive decline.

VOA: standard.2010.06.17

Researcher Katariina Kallio of the University of Turku in Finland says her study on teenagers extends previous research, which found cardiovascular damage in grown-ups who breathed in other peoples' smoke.

VOA: standard.2010.03.04

"A previous study on the genetics of placebo in social anxiety disorder showed that it is serotonin that is associated to placebo responsiveness and not dopamine, " he said.

BBC: Placebo effect may be 'down to genes'

The study builds on previous research which has shown the insula is involved in the onset of mood disorders.

BBC: Mental health (generic)

Dr Ray and his colleague Dr Nicholas Brereton said the latest work built on previous work involving a wider study on willow varieties at the national collection at Rothamsted Research, which is the longest running agricultural research station in the world.

BBC: Sugar-rich willow can boost biofuels' green credentials