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The cone shows some layers of hard rock but most of it is made of relatively soft material .

火山锥显露出很多坚硬岩石层，但更多的组成成分是相对较软的物质。

Monstrous pillars of cold gas like the cone and m16 are common in large regions of star birth .

巨大的由寒冷气体形成的柱体，比如锥状星云和m16星云，在形成新恒星的区域是很常见的。

Quiet for centuries , the volcano was once a perfect cone , but an eruption long ago blew out its flank .

这座火山曾经呈现出完美的锥型，但在很久之前的一次喷发中毁掉了其中一侧，现在火山沉寂了数个世纪。

But birds have an extra cone for seeing violet and ultraviolet light .

但是鸟类有一种特殊的圆锥细胞来看紫罗兰和紫外线。

In particular , zhang 's team suggests that flapping pyramid or cone robots could combine stability and maneuverability .

特别是，张军的团队提出，拍动式金字塔或锥体形机器人可把稳定性和机动性结合在一起。