但从2002年春天开始，以色列的安全形势逐渐改善。

But security in Israel improved progressively from the spring of 2002.

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现在，一个物理学家团队认为这样的情况是不会发生的，因为实际上，黑洞在完全形成之前就会消失殆尽。

A team of physicists now proposes that such a scenario may never occur because the black hole actually disappears before it forms.

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“有关生物燃料的决定应当考虑粮食安全形势，但也应考虑土地和水的供应量，”迪乌夫说。

"Decisions about biofuels should take into consideration the food security situation but also the availability of land and water," Diouf said.

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