因为动词desolate的意思是使人长期感到忧伤 to make (someone) feel very sad and lonely for a long time — usually used as (be) desolated 即人是这个动词的宾语。如果要表示某事使人感到忧伤，用过去分词表示被动意义。desolate也可以是形容词，表示人感到忧伤的，但这个形容词通常用作定语。如词典释义和例句：very sad and lonely especially because someone you love has died or left
desolate [=grief-stricken] parents grieving over the death of their
