First thing, " we need to knuckle down" .

第一个，“我们必须全力以赴”。

To knuckle down, by the way, means to start working hard.

knuckle down是指开始认真工作。

Stretch up through the crown of the head, knuckles down towards the earth and then release.

通过头顶向上伸展，指关节向下朝向下，然后慢慢放松。

So " if we don't knuckle down and finish the project soon, it will all go down the drain."

“如果我们不全力以赴尽快完成这项工程，一切都将付诸东流。”

With just days to go until the final exams, kids on both sides of the educational divide are knuckling down.

期末考试已日益逼近，参与两种教学法的孩子们都开始认真学习起来。

If he doesn’t knuckle down soon, he’ll never get through those exams.

【knuckle】他如果不快点用功，肯定通不过那些考试。

I knew I was gonna have to knuckle down and hopefully, I could've got the best out of the experience.

- 我知道我将不得不屈服，希望我能从这次经历中获得最好的结果。

That's why one of the best ways to beat procrastination is to just knuckle down and do the most difficult, unpleasant thing on your to-do list first.

这就是为什么打败拖延症的最好方法之一就是开始认真工作，先做清单上最难、最令人不愉快的事情。

Psychologists and neuroscientists are increasingly interested in our ability to knuckle down and have looked at what we can change inside our head to make us concentrate.

心理学家和神经学家对我们认真工作的能力越来越感兴趣，他们研究了我们可以在大脑中改变什么来让我们集中注意力。

If you found yourself stranded on an island, you’d quickly need to forget about life’s luxuries and instead knuckle down and focus on the essentials for staying a live.

如果你发现自己被困在一个岛上， 你很快就需要忘记生活中的奢侈，而是全力以赴， 专注于维持生活的必需品。