I suspect that this willingness to risk is in part due to the short expected life span of the humans.
我怀疑这种积极冒险的精神，部分来自人类预期生命跨度之短。
Nowadays, due to the improvement in livelihood and healthcare, the expected life span of our citizens has greatly prolonged. so we have entered into an aging society.
由于生活、医疗条件的改善，我国国民如今的预期寿命大大延长了，已经进入老年社会。
Project design explicitly concerns technical approaches as well as consideration of the existing built environment, natural environment, economic and social factors, and expected life span.
项目设计不仅明确关注技术层面的方法同时也考虑现有的房屋建造环境、自然环境、经济和社会因素以及预期寿命等。
The expected life-span of Beijing residents has gone up to 75.
北京居民的预期寿命已经达到75岁。
While the expected life-span for a mouse is about 25 months, one of the IRS-1deficient mice in this research lived for 38 months 66 per cent longer than a normal mouse.
老鼠预期寿命一般为25月左右，而其中一个缺少IRS-1的老鼠寿命达到了38月-比同类长66％。
While the expected life-span for a mouse is about 25 months, one of the IRS-1deficient mice in this research lived for 38 months 66 per cent longer than a normal mouse.
老鼠预期寿命一般为25月左右，而其中一个缺少IRS-1的老鼠寿命达到了38月-比同类长66％。
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