(Speech) The former Czech Republic president said the changes in 1989 were "undoubtedly aided by people who,for long years" tried to show the world "the real situation" in what was then Czechoslovakia.

VOA: standard.2009.11.17

You show the child the following situation.

你向儿童呈现下列场景

耶鲁公开课 - 心理学导论课程节选

You show the child the following situation.

你向儿童呈现下列场景

耶鲁公开课 - 心理学导论课程节选