1. Republicans and Democrats are at odds over who is to blame for what both parties describe as a crisis.
at odds 不和,有矛盾
An adviser said there was no reason why the two countries should remain at odds.
一位顾问说这两个国家不会一直这样争执下去
。2. The security of our nation and our border is first and foremost the responsibility of our president.
first and foremost 首要的
He does a little teaching, but first and foremost he's a writer.
他干一点教学,但首要的是写作
。