平均期望寿命曾是40岁。
为什么日本的期望寿命这么高？
在世界某些地区，女性在期望寿命方面的优势正逐步丧失。
The female advantage in life expectancy is being lost in some parts of the world.
目的对居民期望寿命和健康寿命的应用进行分析。
Objective To analyze the application of life expectancy and health expectancy.
因此，为了满足高强度皮带寿命的要求和期望。
Thus, to meet the high strength requirement and expectation on the belt lifetime.
因此，为了满足高强度皮带寿命的要求和期望。
Thus, to meet the high strength requirement and expectation on the belt lifetime.
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