No one's ever managed to cool anything down that much, but even if we could, molecules would still move due to a quantum mechanical principle called zero-point energy.

至今没有人曾创造出那样的低温环境，但是即使我们可以，根据量子力学的中零点能量的解释，分子在那样的情况下仍能运动。

Studying mechanical principles, da Vinci designed many useful devices, such as this machine for twisting ropes or a crane used to build canals, that greatly improved the efficiency of Renaissance craftsmen.

达芬奇通过研究机械原理，设计出如用来捻绳的机器或挖掘沟渠的起重机等许多非常有用的设备，极大地提升了文艺复兴时期工匠的工作效率。