这些木制家具经过烟熏处理以防止虫蛀。

The wooden furniture was fumigated to protect it from insects.

fumigated 是动词 fumigate 的过去分词形式，表示"经过烟熏处理的"。fumigate 由词根 fum（烟）和动词后缀 -igate（使...化）组成，字面意思是"使烟化"，即"用烟熏法消毒/杀虫"的处理方式。