The issue is due to the software limitation of V2.5 migration, in addition to other environmental issues.

此问题是由V2.5迁移的软件限制导致，而不像其他环境问题。

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The study of radon release and migration is the basic theoretical issue for radon measurement, which has close relationship with extensive applications in geoscience, environmental science and so on.

氡的释放和运移规律及机制研究是氡气测量的基础理论问题，它与氡在地球科学、环境科学等领域的广泛应用密切相关。

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The article discussed the environmental behaviors of toxaphene including its residual, biological toxicity, migration and degradation.

文章综述了毒杀芬残留、生物毒性、迁移与降解等环境行为；

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To investigate the exact nature and impact of these changes, UNESCO is launching two studies on the relationship between environmental degradation and migration in the Sahel.

UNESCO: OFFICE IN DAKAR

This differs from migration caused by catastrophic environmental events such as hurricanes and earthquakes.

CNN: 'Climate change' forces Eskimos to abandon village

Collaboratively, the participants explored the factors that threatened Cambodian intangible heritage such as environmental problems, poverty, and migration, and discussed ways to support the sustainable development of Cambodian cultural traditions so that they could continue to exist for future generations.

UNESCO: Communities, government and local cultural experts key in the successful implementation of the 2003 Convention on Safeguarding Intangible Cultural Heritage | United Nations Educational, Scientific and Cultural Organization