Keep on hammering away at achieving your goals.

【hammer】为达到目标要坚持不懈。

I keep hammering away at this point because it’s important.

【hammer】我一直反覆强调这一点，因为它很重要。

I mean, 45 minutes, an hour, and he's just hammering away at you and at the points he's making.

我的意思是，45 分钟，一个小时，他只是不断地对你和他所提出的观点进行反复强调。