The Ark is an attempt to answer the challenges of our time.

方舟是对时代挑战的一种尝试性回应。

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"It is time for a breakthrough to a new Europe," she said. "Because the world is changing so much, we must be prepared to answer the challenges."

“是时候重造欧洲了，”她说，“世界变化如此之大，我们必须准备好应对挑战。”

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How we translate the growing connection between the Indian and Pacific oceans into an operational concept is a question that we need to answer if we are to adapt to new challenges in the region.

如果我们要适应在该地区面临的新挑战，如何把印度洋和太平洋之间日益增长的关系变成一个操作性理念是我们需要回答的一个问题。

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"Cloud-based browsing is a next-generation answer to the challenges of the modern internet, " said Arkady Volozh, CEO of Yandex.

ENGADGET: Yandex launches its own browser targeting Russian market

He gave a speech in response to the original Ryan budget that was very clear about why he felt that it was not the right answer to our challenges economically.

WHITEHOUSE: Press Briefing

Obviously this is a change in debate, and this administration is doing everything it can to both make sure the American people know exactly what's happening inside the administration and also to answer questions that people might have or challenges that might come about the way that we're doing things.

WHITEHOUSE: Press Briefing by Deputy Press Secretary Bill Burton