他承认曾与一位同事有染，背叛了他的妻子。
He admitted he had cheated on his wife with a colleague.
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cheated英 /ˈtʃiːtɪd/|美 /ˈtʃitɪd/
on英 /ɒn/|美 /ɑn/
解释
cheated 是动词 cheat 的过去分词，与 had 构成过去完成时，表示“欺骗”的动作发生在 admitted（承认）之前。
on 是介词，在这里与 cheat 固定搭配，构成短语 cheat on sb。
cheat on sb 意为“对伴侣不忠、出轨”，特指在感情或婚姻关系中背叛伴侣。
He admitted he had cheated on his wife with a colleague.
cheated 是动词 cheat 的过去分词，与 had 构成过去完成时，表示“欺骗”的动作发生在 admitted（承认）之前。 on 是介词，在这里与 cheat 固定搭配，构成短语 cheat on sb。 cheat on sb 意为“对伴侣不忠、出轨”，特指在感情或婚姻关系中背叛伴侣。