Learning happens in the hippocampus, a brain region that plays a key role in acquiring memories.

学习发生在脑部的海马状突起中，这是获取记忆最关键的脑部区域。

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The hippocampus is a key brain region in circuits involved in spatial navigation and memory, and thus has been the focus of research to decode these functions.

海马是脑回路中涉及空间定位和记忆的关键大脑区域，也因此成为研究如何解码这些功能的焦点。

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But the key to reviving agriculture in the region may be a land certification effort that has reassured farmers their land won't be taken from them without compensation, as has happened in the past.

但振兴本地区农业的关键可能在于土地发证工作，而此项工作向农民确保了以下一点，即其土地不会像过去一样在得不到补偿的情况下被征用。

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King Abdullah said he has urged the president to focus on the Israeli-Palestinian dispute, saying that is the key to resolving all the other problems in the region.

VOA: standard.2009.04.26

The man in the newly released video , is identified as Humam Khalil Abu-Mulal al-Balawi, who blew himself up inside a key U.S base in an eastern Afghan region bordering Pakistan.

VOA: standard.2010.01.09

Over the weekend, the right-leaning Christian Democratic Party (CDU) of German Chancellor Angela Merkel suffered an embarrassing, yet predictable, defeat by the left-leaning Green party in a key region of Germany.

FORBES: Merkel's Defeat and the EU Sovereign Debt Crisis

But the edicts he issued were not as harsh as under some other Taliban groups elsewhere - a key reason why there was no tribal unrest in the region under his control.

BBC: Obituary: Mullah Nazir

From a foreign policy perspective, she adds, it is also a smart move for the United States to strengthen its economic ties with several key countries in a region with at least one vocal anti-American leader, Hugo Chavez of Venezuela.

FORBES: Free Trade Deals: Where Are We Now?