The biggest single factor in putting time on the nuclear clock appears to be Stuxnet, the most sophisticated cyberweapon ever deployed.

拨慢了核时钟最大的单一因素就是超级工厂病毒，这有史以来最具杀伤力的网络武器。

youdao

The clock setting, which has been a staple since 1947, represents the severity of the perceived threat to humanity from nuclear or biological weapons, climate change and other human-caused disasters.

“末日之钟”于1947年设立，代表了人类感受到的来自核武器或生化武器、气候变化及其它人为灾难等威胁的严峻程度。

youdao

"We are all concerned about Iran running out the clock on us on their nuclear program,".

VOA: standard.2009.09.17

Possible alternatives include ending the requirement to have nuclear weapons on submarines at sea round-the-clock, or using different submarines and cruise missiles.

BBC: Labour 'open' to cheaper Trident alternatives