2001年1月16日：使用一种简单到让人吃惊的技术，天文学家已经揭示了我们对于恒星形成的最早的阶段中间，消失的一环。

January 2001: Using a surprisingly simple technique, astronomers have illuminated a missing link in our understanding of the earliest period of star formation.

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环壁脐样凹陷在星形细胞来源肿瘤、脑转移瘤、脑脓肿三者中出现率相近，无明显定性价值。

The incidence of umbilicated indentation in astrocytoma, cerebral metastases and brain abscess was nearly the same, showing no value in qualitative diagnosis.

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分化较好的星形细胞瘤中可以见到内环是血管基膜、外环是胶质膜的双环结构。

In the well-differentiated astrocytoma showed structure of ring upon ring, the inner ring was the basement membrane of blood vessel, while the outer ring was the glial membrane.

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