Enter into politics; enter into negotiations.
从政；参加谈判

The nations entered into a new agreement.
这些国家签署了一项新的协议

Financial matters entered into the discussion.
财政问题纳入讨论之列

The report entered into the effect of high interest rates on the market.
这报告讨论的是市场高利率的影响

We enter on a new era in our history. They entered upon the most dangerous part of the journey.
我们进入了历史上的新纪元。他们开始了旅行中最危险的阶段

After discussing the budget deficit, they entered on the problem of raising taxes.
讨论过预算赤字之后，他们开始考虑增税问题了

She entered upon the estate of her uncle.
她获得了她叔父的不动产

He entered upon a turbulent political career.
他开始了动荡不定的政治生涯。