She tried extra hard.

她特别努力。

《牛津词典》

That makes it extra hard to learn and practice it.

这使得学习和练习英语变得特别困难。

youdao

And I promised her that I am going to work extra hard to get it.

我当时向她保证，为了拿到金牌一定会加倍努力。

youdao

I know I will need to work extra hard.

我知道我得在工作上再加把劲儿。

I want to 实战 - SpeakingMax英语口语达人

But, come Monday night, he'll be tuned in and pulling extra hard for his beloved Tide.

NPR: 40 Years Ago, Irish-Tide Played Game For The Ages

If you have a poor or weak employment brand you have to work extra hard, and often the best people go elsewhere.

FORBES: Understanding the LinkedIn Talent Brand Index

"We're going to have to work extra hard to get those pucks through and then get them to reach the net, " Julien said.

WSJ: Bruins face Lundqvist and shot-blocking Rangers