Put a string through the hole.

把一根绳子穿过这个洞。

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Originally they were round pieces of metal with a hole in the center, so that a piece of string could keep them together.

最初它们是圆圆的金属片，中间有一个洞，这样一根绳子就可以把它们串在一起。

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When extended to five dimensions, it becomes a "black string," and unlike a normal 4d black hole, it is unstable (this ignores the fact that 4d black holes eventually evaporate).

当黑洞扩展到第五维度，它就变成“黑弦”。和正常的黑洞不同，黑弦很不稳定(这里忽略了四维黑洞其实最终会蒸发)。

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