By the time the higher elevations are reached, such strange notions as Einsteinian curved space-time and the quantum uncertainty principle, heavy meals indeed, seem not so difficult to digest.

• 当攀登到一定高度时，像爱因斯坦的时空卷曲论和量子不确定原理等概念就出现了；而这些难以咀嚼的食物也就变得不那么难于消化了。