The center of circle is the position of the centre hole for positioning.

该圆周的圆心即定位的中心孔位置。

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Rotor guide magnet heart is a cylinder with centre hole or a cylinder scraping both sides, and is mounted on rotor shaft.

转子导磁铁心为带有中心孔的圆柱或一削去两边的圆柱，套装在转子轴上。

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It has strong rigidity and high locating accuracy, simultaneously, it can compensate the axial size error accused by the centre hole size of the shaft.

该顶尖刚性强、定位精度高，能补偿由于被加工轴的中心孔误差所引起的轴向尺寸误差。

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An active galaxy is a star system with a humongous black hole at its centre.

ECONOMIST: Cosmic rays: They came from outer space | The

Measurements undertaken with two space-based X-ray telescopes imaged the black hole at the centre of galaxy NGC 1365.

BBC: First glimpse of a black hole's spin

But despite being millions of times more massive than our own Sun, the black hole at the centre of our galaxy would be relatively small in cosmic terms.

BBC: By BBC News Online Science Editor Dr David Whitehouse