He entered politics when he was 30.

他三十岁时步入政界。

youdao

He entered politics when he was 27.

他在27岁时步入了政界。

youdao

After a decade in real estate, I left the industry and entered politics.

在房地产业干了十年后，我离开了这个领域，投身政界。

youdao

He entered politics and served in the Virginia legislature.

VOA: special.2009.01.29

Bain Capital has been discussed ever since Mitt Romney first entered politics in 1994.

FORBES: Mitt Romney's Bain Capital Image Problem -Media Training

Dutt entered politics by campaigning for the regional Samajwadi Party during the 2009 general elections.

BBC: Sanjay Dutt: Bollywood's bad boy

Before he entered politics, Wellstone was a political science professor at Carleton College in Minnesota.

CNN: Wellstone made mark as liberal champion