Nathaniel Brandon has been a therapist for fifty years; he's done a lot of rigorous philosophical and psychological research and work on the concept of self-esteem.

Nathaniel Brandon曾做过50年的治疗专家。他完成了许多严格的哲学和心理方面的研究，并且从事有关于自尊心的工作。

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FIFTY years ago, William Russell, a classics scholar, and Rex Burch, a microbiologist, outlined how the use of animals in scientific research could be made more humane.

50年前，古典学者威廉·拉塞尔和微生物学家雷克斯·伯奇，针对如何让动物实验更具有人道性这个问题拟定了摘要。

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The question of coupled vibration of fluid-conveying pipes is hotspot in the research areas of pipeline fluid Mechanics and Nonlinear Dynamics for late fifty years.

输流管道耦合振动问题是近五十年来管道流体力学、非线性动力学等领域研究的热点。

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After many years of research, he wrote the book "The Origin of Species" in eighteen fifty-nine.

VOA: special.2009.12.16

Fifty years of research on the effect of TV violence on children leads to the inescapable conclusion that viewing media violence is related to increases in aggressive attitudes, values, and behaviors.

FORBES: Hollywood's Liberal Use Of Violence Makes It The Modern Lady MacBeth

And yet, despite companies pouring billions and billions more each year into research and development, the number of new drugs approved annually has held roughly constant for over fifty years.

FORBES: The Big Shrug: Both Democrats and Republicans Accept Tech Stagnation in Medicine