Once they get an idea into their heads, they never give up.

他们一旦接受了某个想法，就永远不会放弃。

《柯林斯英汉双解大词典》

They'll succeed in working out the problem because they never give up.

他们会成功地解决这个问题，因为他们从不放弃。

youdao

The twin brothers have one thing in common: they never give up easily when they face difficulties.

这对孪生兄弟有一个共同点：遇到困难从不轻易放弃。

youdao

Those whose children have yet to be recovered are searching tirelessly, proclaiming that they will never give up.

CNN: I, too, am an abduction survivor

For the parents, this is one battle they will never give up on.

BBC: Birmingham Children's Hospital

If they cannot address this now, it's as if they think they can never address it and they will give up and this will go on.

BBC: Newtown shooting: Dylan Hockley's parents recall attack