Nature produces them only very slowly, parsimoniously, and at a constant rate.

但大自然对这些人物的造就非常缓慢。非常吝啬，而且始终如此。

The energy released by the watch engine, the barrel, must be mastered, controlled and distributed parsimoniously at a rate corresponding to the real flow of time, to its exact measure.

机械表发条盒的能量释放，应该是可以控制地、均匀地、稳定地、可测量地在释放的过程中。