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.
养殖阶段安全溯源指标主要包括疫病、兽药残留、重金属超标以及环境消毒物；
The security traceable index of breeding stage includes diseases, veterinary drug residues, excessive contents of heavy metals and environmental disinfection materials.
平整度是高等级公路质量控制中的重要指标之一，平整度的好坏直接影响公路使用质量、行车舒适、安全，同时也关系到公路环境质量。
Evenness is an important index of quality control of high grade highway. Evenness not only influences on highway usage quality, smooth drive and safety, but also on highway environment quality.
制动性能是关系到电动自行车行驶安全的一项重要指标，传统的路检方法费时费力，受人为和环境因素的影响大。
An important index for safety running of electric bicycle is brake performance. The traditional testing technique costs time and vigor. Manpower and environment factors both affect it enormously.
制动性能是关系到电动自行车行驶安全的一项重要指标，传统的路检方法费时费力，受人为和环境因素的影响大。
An important index for safety running of electric bicycle is brake performance. The traditional testing technique costs time and vigor. Manpower and environment factors both affect it enormously.
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