We must work harder in order to catch up with others.

她决定努力学习以便赶上别人。

youdao

We must work harder so that we may fulfil our plan ahead of schedule.

我们必须努力工作，以便能提前完成计划。

youdao

To solve the above-mentioned problem, we must work harder than ever before.

为了解决上述问题，我们必须比以前工作更努力。

youdao

Wherever conflicts rage, we must work harder for peace, always focused on helping the most vulnerable.

UN: Secretary-General

And we must all work harder to secure and fully implement the new standard that will see oil, gas and mining companies reporting project by project payments across the world without exception.

WSJ: David Cameron: A British-American Tax and Trade Agenda

We must not take away from these remarkable achievements, ministers would intone: children today work much harder than in my day, and teachers are doing a wonderful job.

ECONOMIST: Fixing British education