I keep my pledge.

我信守我的誓言。

youdao

It was risky, because in order to keep my pledge to cut the deficit in half in four years, I had to trim the middle-class tax-cut proposal.

这样做是有风险的，因为要实现在四年内将赤字减半的承诺，我必须削减给中产阶级减税的提案。

youdao

But I can promise you this: I pledge to do everything in my power as President of the United States to keep the American people safe.

WHITEHOUSE: President Obama Addresses Members of the Joint Terrorism Task Force | The White House