To make one step and then want another; never satisfied with one's gains, always striving for more, often implying excessive ambition or greed.
他工作表现出色，很快就被提拔为主管，但他得步进步，又开始谋划更高的职位了
He performed excellently at work and was quickly promoted to supervisor, but he's already pushing for a higher position, never satisfied.
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