Decentraction of the conn-rod small end hole center with the excircle center of the conn-rod small end hole blank, which causes the hole wall of one side getting thin with the strength dropping.

连杆小头孔中心与连杆小头孔毛坯外圆中心不同心，使一边孔壁变薄，强度下降。

youdao

Most astronomers believe that the large concentration of mass at the galaxy's center is a black hole whose gravity is causing the gas to whirl.

大多数天文学家认为，星系中心的大量物质是一个黑洞，它的引力导致气体旋转。

youdao

Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of many of the 100 billion other galaxies estimated to exist in the universe.

最近的发现有力地支持了这样一种理论，即银河系中心，和宇宙中估计存在的1000亿个其他星系中的许多里有一个黑洞。

youdao

Seeds or a young planting grow out of a hole in the center.

VOA: special.2010.07.13

Use your fingers to make a hole in the center and expand the hole so that the dough will fit around the tube.

NPR: Two Centuries of 'Baking in America'

Removing Google Reader rips a hole in the center of an active user's online life.

ENGADGET: The outrage and sadness of Google Reader's demise

You might feel that "enough" time has passed now, that the hole at the center of you should not be there at all.

WSJ: Augusten Burroughs on How to Live Unhappily Ever After