To have an ulterior motive; to have a hidden agenda; to have other plans or designs.
他表面上热情帮助，但我觉得他别有企图，想从中获得好处。
He seemed enthusiastic to help, but I suspect he has an ulterior motive, wanting to gain benefits from it.
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To have an ulterior motive; to have a hidden agenda; to have other plans or designs.