在理论物理学中，近似的艺术往往比精确解更重要。

林业创新不是可选项，而是生存的必需。

The stars near the galactic center are like cosmic clocks, helping us map spacetime.

Memory， I realize， can be an unreliable thing； often it is heavily coloured by the circumstances in which one remembers.

物理定律必须以独立于坐标系选择的方式表述。