They were sent up with early space flights to see how human cells coped with zero gravity and exposed to radiation to test the effects of nuclear weapons.

这些细胞随着早期的航天飞行被送上太空，用以观察人类细胞在失重的状态下如何存活，并将它们暴露在辐射中用以测试核武器的影响。

youdao

Radiation levels have been monitored by the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), which operates 63 surveillance stations around the world.

全面核禁试条约组织(CTBTO)筹备委员会在世界各地设有63个监视站，正在对辐射水平进行监测。

youdao

Radiation levels are being monitored by the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), which operates 63 surveillance stations around the world.

全面核禁试条约组织(CTBTO)筹备委员会在世界各地设有63个监视站，正在对辐射水平进行监测。

youdao

Turning to North Korea, South China Morning Post says many internet users are sceptical over safety assurances from environmental authorities about potential radiation from North Korea's nuclear test on Tuesday.

BBC: China media: Wukan frustration