Doctors have replaced the top of his hip bone with a metal sphere.

医生用一个金属球体置换了他的股骨头。

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The image potential is effectively given by the image potential of an ideal metal sphere with atomic size.

碳纳米管镜像势的作用可以等效地用原子尺寸的理想金属球的镜像势来代替。

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But telling alien civilizations when we lived and how Earth was in our time is not the main objective of this 406kg metal sphere.

但是，告诉外星文明我们正处在地球的哪一时期并不是这个406公斤的金属球体的主要任务。

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Old-fashioned planetarium projectors used a metal sphere, pierced with thousands of holes and illuminated from within, to mimic the starry sky.

ECONOMIST: The joys of indoor star-gazing

The two times humans have reached the deepest part of the ocean, it required a foot-thick flawless metal sphere with barely enough internal space to sit down.

FORBES: Why Don't We Spend More On Exploring The Oceans, Rather Than On Space Exploration?