Earth Day, celebrated on April 22 each year, marks the anniversary of the birth in 1970 of the modern environmental movement in the United States.

每年4月22日的“地球日”(Earth Day)是1970年在美国诞生的现代环保活动纪念日。

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The first recording in Potsdam of such teleseisms on April 17, 1889 marks the birth of the study of the structure of the Earth by means of seismic waves ( see blog January 14, 2009).

1889年4月17日在波茨坦对远震的成功记录标志着通过地震波方式研究地球结构的开始。

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"Elvis! His Groundbreaking, Hip-Shaking,Newsmaking Story" marks the seventy-fifth anniversary of Elvis Presley's birth year.

VOA: special.2010.04.02

This year marks the 200th anniversary of Chopin's birth, and the Polish parliament has declared 2010 to be the official Year of Chopin.

VOA: standard.2010.03.04

Christians around the world are celebrating Christmas, which marks the birth of Jesus Christ in Bethlehem.

BBC: Pope Benedict in Christmas plea for Syria solution

And 40 years after it opened, the spiritual retreat once viewed by critics as a hippie commune, now hosts Janmashtami, the largest Hindu festival in Europe, which marks the birth of Krishna, a popular God in the Hindu Pantheon.

BBC: 'George Harrison' Bhaktivedanta Manor Hindu temple at 40

It marks what could be a re-birth for the longstanding bookmarking service, which was acquired by Yahoo back in 2005.

FORBES: YouTube's Chad Hurley And Steve Chen Bookmark Delicious