这副耳塞能减弱噪音，让你睡得更香。

These earplugs ___deaden the noise so you can sleep better.

厚重的窗帘减弱了外面的噪音。

The thick curtains ___deaden the noise from outside.

长期的工作压力使他变得麻木，难以感受生活中的快乐。

The constant work stress has ___deadened his ability to enjoy life's pleasures.