长期的过度工作耗尽了他的精力，让他变得无精打采。

The constant overwork ___devitalized him, leaving him listless and drained.

长期的压力使他精力逐渐衰竭。

The constant stress slowly ___devitalized him over time.

牙医建议对这颗发炎的牙齿进行去髓处理以避免感染扩散。

The dentist recommended ___devitalizing the inflamed tooth to prevent the infection from spreading.