Category two experiments could be allowed but "would require strong scientific justification".

第二类实验可以被允许，但“需要有强有力的科学根据”。

youdao

P. A. was rushing to document the scientific justification for its proposed finding that emissions of carbon dioxide and five other greenhouse gases endangered public health and the environment.

当时美国环保局正在急于证明所提议的这项发现：二氧化碳和其他五种温室气体的排放会危害公众健康和环境。

youdao

It calls for scientific justification before stopping and then reversing the growth of greenhouse gases.

NPR: Bush, Britain and Greenhouse Gases

But at the inquiry he revealed that his statement should have read that "there is no scientific justification for not eating British beef".

BBC: Medical officer tells of BSE secrecy

But Farmers' Union of Wales President Bob Parry said he wanted to see scientific justification for killing healthy animals, to ensure it was not being done for political reasons.

BBC: Show doubt as outbreaks reach 20