It means that they can never be destroyed.

是指他们永远不会被破坏。

youdao

Its power, its knowledge, can never be destroyed. It can only transform.

它的能量和知识永远不会毁灭，只是变换了形态。

youdao

I taped the score back together and encased in a plastic shield so that it could never be destroyed again.

我将乐谱粘好并把它镶在一个塑料套子内，以防止它被再次损坏。

youdao

There were places that would never be destroyed by a fire or a tornado or an earthquake, just as there were those lucky people who escaped disasters unscathed.

NEWYORKER: Alone

Whether it could have stolen a march on the big boys of mobile, or whether (more probably) it would have had the same hardware, marketing and distribution problems that befouled its larger cousin will never be known: the TouchPad Go was cancelled in utero and almost all existing models were destroyed.

FORBES: Mobile Sesame - Open webOS Escapes Onto Google Hardware

The exact number may never be established: after the first Gulf war, unreliable estimates were obtained by extrapolating from the number of destroyed Iraqi vehicles.

ECONOMIST: Assessing the campaign: The reckoning | The