研究员依据六项指标对各国进行了评级：物质满足感；住房与环境；教育的完善程度；健康与安全；危险行为；学校生活的质量。
Researchers ranked countries on variables in six categories: material well-being; housing and environment; educational well-being; health and safety; risky behaviour; and quality of school life.
科学家们已经设定了一些主要环境指标的安全阈值，而一旦超出这些值，将会危害到地球物种的生存。
Scientists have set thresholds for key environmental processes that, if crossed, could threaten Earth's habitability.
在滨海旅游活动中，海岸带环境的某些指标对旅游者旅游体验、身体健康、甚至生命安全有着十分重要的影响。
To the touring activities on the shore, some indexes of environment have great infections on touring experience, healthy, even safety of life.
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