Their house was burglarized while they were on vacation, and some valuables were stolen.

burglarized 是动词 burglarize 的过去分词形式，在句中表示被动。burglarize 由名词 burglar（入室盗窃者）加上动词后缀 -ize 构成，意思是"进行入室盗窃"。burglarized 表示"遭到入室盗窃的"。 注意：burglarize 是美式英语用法，在英式英语中对应的动词是 burgle。