To betray one's group or collective for personal gain and glory.
为了个人的升迁和财富，他竟然不惜出卖团队的机密，这种求荣卖国的行为令人不齿。
To advance his career and accumulate wealth, he unscrupulously betrayed the team's confidential information. This kind of act, seeking personal gain through betrayal, is truly contemptible.
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