The shifting popularity of subjects often reflects shifts within the business world, Executive Speakers' Schelp says.

高管演讲公司的舍尔普说，流行主题的变化往往反映出商业世界内部的变迁。

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They played the recordings for test subjects and asked them to rate their perceptions of the speakers' attractiveness, leadership potential, honesty, intelligence and dominance.

他们为试验对象播放了录音，并要求试验者对演讲者的吸引力、领导潜能、真诚度、智慧以及主导力进行评估。

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It also helps people who are fluent English speakers understand complex subjects.

它也能帮助人们理解复杂的主题英语流利。

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Students and speakers discuss subjects like AIDS, world religions, nuclear weapons,immigration, climate change and politics.

VOA: special.2009.11.12

Designed to spark the interest of middle and high-school girls in science, technology, engineering, and math (STEM) subjects, the Women in STEM Speakers Bureau was launched by the White House Council on Women and Girls and Office of Science and Technology Policy in September of last year.

WHITEHOUSE: STEM Women All-Stars Hit the Road

The events had counted on the presence of national and international speakers, who shared experiences and deep thoughts on subjects concerning African and African-Brazilian History and Culture, as well as Education on ethnic-racial relations.

UNESCO: OFFICE IN BRASILIA