Broken cocoon as a graduate design exhibition propositions, metaphors that the students through four years of university study and life, will soon face a new life and working environment of a state.

破茧作为毕业设计展的命题，隐喻了同学们通过四年的大学学习和生活，即将面临新的生活和工作环境的一种状态。

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For the wise man who had led the Union through four years of bloody civil war Father Abraham -- was dead.

VOA: special.2010.01.07

Over the past four years he traveled around the world with recording equipment and video cameras in an effort to unite people through music.

VOA: special.2009.07.31

Walking through these historic areas, visitors today might find it hard to believe that a deadly storm swept through the city over four years ago.

VOA: special.2010.01.22

To make this discovery, the researchers sifted through four years of data tracking gamma-rays that were created by pions.

FORBES: Scientists Confirm Cosmic Rays Come From Exploding Stars

Ella went through four years of chemotherapy, several major surgeries and six weeks of radiation all before the age of 7.

CNN: Helping patients navigate the health care system

Under Edward Breen, Mr Kozlowski's successor, Tyco brought in outside lawyers and accountants to comb through four years' worth of company records.

ECONOMIST: Tyco: Not guilty, your honour | The