【Learn A Word】502 一般规律
【今日情节】今天我们要学的词是rule of thumb。 Rule of thumb, 经过反复实践，得出的一般规律。
【友情提示】只需听写文中出现的英文句子，今天有2个句子哟。^_^
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http://t1.g.hjfile.cn/listen/201305/201305121036532638238.mp3The rule of thumb is that by eating 15 % less starting at age 25 you could add 4.5 years to your life.
As a rule of thumb, shut off your engine if you expect to be sitting for more than 30 seconds.一般规律是，如果你从25岁开始，饭量减少15%，就能多活四年半。
一般来说，如果停车超过半分钟，就应该熄灭引擎。
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