IN GREEK legend, the hydra was a many-headed monster. If a head was severed, it grew back.

希腊神话中，许德拉是一头九首怪物，它的头如果被砍，马上就会长回；其实在某些故事版本中，会很快长出两个头。

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In 2000, Japanese researchers placed Physarum polycephalum - the name means "many-headed slime mold" - in a maze, along with two blocks of food.

2000年，日本研究人员将多头绒泡菌(Physarum polycephalum)—意思是“多头黏菌”—连同两块食物一起放入一个迷宫。

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Like its neighbours, Slovakia has seen wages rising fast as new jobs arrived and many of its own people headed west.

随着新的工作机会的到来，斯洛伐克的工资水平迅速提高，同时很多斯洛伐克人开始涌入西欧国家打工，邻国的情况也是一样。

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Faced with such a many-headed hydra, what can the record industry do?

ECONOMIST: Napster��s wake-up call

Higher levels of school autonomy are a characteristic of many higher performing systems - headed by China, the Netherlands, the UK and Hong Kong (which is considered as a separate school system in such education rankings).

BBC: UK education sixth in global ranking

Afterward, many of the black-tied guests headed to the David Koch Theater across Lincoln Center for a reception.

WSJ: Celebrating the Power of Barbra