The period of Wei, Jin Southern and Northern Dynasties is the first transition time in the history of Chinese classical gardens.

魏晋南北朝时期是中国古典园林史上第一个转折期。

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The biggest transition this year is Pluto moving into Capricorn (Chart 1) on January 25 for the first time in 247 years.

这一年最大的转变是冥王星在247年以来，第一次于1月25日进入摩羯座。

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The possibility to realize high photoelectric transition efficiency and low manufacture cost of light voltage battery of transversal grads material structure is put forward for the first time.

首次提出实现横向梯度材料结构光伏电池高光电转换效率和低制作成本的可能性。

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This isn't the first time Enron's grand transition has faltered.

FORBES: Scapegoat

Democrats, anticipating control of the Senate for the first time since 1994, went to the Republican leadership to start preliminary discussions on transition of power.

CNN: Jeffords split with GOP could hamper Bush agenda

This time, Tunisians will go to the polls to participate in the first election a transition country has hosted since the Arab Spring began.

WHITEHOUSE: President Obama's Bilateral Meeting with Prime Minister Essebsi of Tunisia | The White House