MyCn18之所以呈现出沙漏的外形，是因为一个缓慢扩张的云团里迅速向外冲去的恒星风造成的，其“赤道”附近的云团密度要大于两极。
MyCn18's hourglass shape is thought to have arisen from the expansion of a fast stellar wind within a slowly expanding cloud which is denser near its equator than its poles.
利用本质子群与本质扩张的概念，证明了极根类恰是本质闭类。
By the basic concept of essential subgroups and essential extensions, a surprising result is given in this paper.
血管畸形中血管极度扩张，VEGF表达极弱。
In vascular malformation, vessels dilated abnormally with weakly expressed VEGF.
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