在跑鞋的寿命达到一半之后，你就应该买一双来轮着用。
About halfway through the life of your running shoes, you might want to buy another pair of running shoes to rotate into your runs.
我看到报道说蓝山附近一个小村庄的人平均寿命达到88岁。
I read that the life expectancy of people in a small village near the Blue Mountains is up to 88.
它比老式灯泡少消耗90%的电力，而且平均寿命达到25000小时。
It USES 90% less power than an old-type bulb and has an average life of 25,000 hours.
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