维多利亚时代流传着一则箴言：“造物主赋予人类嘴唇以遮掩牙齿”。这暗示了在严格意义上的牙科学诞生之前，口腔的卫生状况往往非常糟糕。
"Nature gave us lips to conceal our teeth," ran one popular Victorian maxim, alluding to the fact that before the birth of proper dentistry, mouths were often in a shocking state of hygiene.
在今年之前，所有的人造物体的移动都遵循经典力学的法则。
The First Quantum Machine : Until this year, all human-made objects have moved according to the laws of classical mechanics.
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