智者说：“所有的书都说，买鞋必须按照你现有鞋子的精确尺寸。”

The wise man said, "All the books say shoes must be bought with the exact measurements of the shoes you already own."

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在玻璃片上制作精确尺寸的45通孔，并非易事。

It's very difficult to make a hole on the wafer with a 45-degree Angle exactly.

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感谢德国天文学家，我们现在知道了躺在我们银河系中心的那个黑洞的精确尺寸。

Thanks to German astronomers, we now have the most accurate measurements yet of the giant black hole that sits at the centre of our galaxy.

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