Only by working hard can we succeed in doing anything.

只有通过努力工作，我们才能获得成功。

youdao

Only by working hard did he succeed.

就是靠努力工作他才取得了成功。

youdao

Only by working hard, can we pass the exam.

只有努力地学习我们才能通过考试。

youdao

There can be a lot of reasons but the only way to turn it around is by working hard, getting in the gym and practising as hard as you can.

BBC: Andy Murray to play Czech Jan Hajek in Wimbledon opener

He was not only vetted by TaskRabbit, but he was hard-working, showed up on time, and was a pleasure to work with.

FORBES: Enter the Virtual Workforce. TaskRabbit and Gigwalk

Arsenal only had themselves to blame and despite working hard to restore parity, their play was characterised by a general lack of urgency, creativity and precision in the final third.

BBC: West Brom 2-2 Arsenal