Used with past participle to form passive voice.
与过去分词连用，成被动态。
They have the same form as the past participle of a transitive verb and have a passive meaning.
它们的形式与及物动词的过去分词相同，且有被动的含义。
They have the same form as the past participle of a transitive verb and have a passive meaning.
它们的形式与及物动词的过去分词相同，且有被动的含义。
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