The animals were tested for how well they remembered spatial features in their environment for locating a preferred escape hole to exit a well-lit maze and hide.

这些动物通过逃离迷宫钻进树洞隐藏起来从而被测试对环境的空间记忆力。

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Astronomers and scientists think that a black hole is a region of space (not a thing) into which matter has fallen and from which nothing can escape - not even light. So we can't see a black hole.

天文学家和科学家们认为黑洞是个空间区域，物体会掉进去，而没有物体能从中逃逸出来——即使是光也不能，所以我们看不到黑洞。

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According to classical theory, at the boundary of a black hole-the so-called event horizon-light can no longer escape.

在经典理论中，在黑洞的边界，即通常所称的事件穹界，光是不能逃逸的。

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Its event horizon, the outer edge inside which not even light can escape from the black hole's gravitational pull, would be only about 7.5 million kilometres.

BBC: By BBC News Online Science Editor Dr David Whitehouse

Aaron Craft scored nine points on 2-for-12 shooting for the Buckeyes, who dug a hole too deep to escape with their second-half rally.

WSJ: Wichita State Upsets Ohio State

It was the housing market that helped pull the US economy into the black hole it has yet to escape from nearly three years later.

FORBES: Double Dip in Housing; Could Double Dip Recession Be Next?