diffuse

窗帘柔和地散射了午后的阳光。

The curtains ___diffuse the afternoon sunlight softly.

教授的讲座内容太过散漫，让人难以抓住重点。

The professor's lecture was too ___diffuse to grasp the main points.

窗帘能柔化阳光，使室内光线更加柔和。

The curtains help to ___diffuse the sunlight, making the room lighting softer.