While studying warships, Fuller realized that they weighed much less than buildings, yet were able to do much more.
VOA: special.2010.05.30
But since life expectancy in the Ancient World was much less than ours, you didn't have usually several generations in these households, because older people just died.
但是古代人的寿命没我们长,一般不会出现几代同堂,因为年纪大了去世了。
For most of you on your homework assignments, I'm hoping it's a little less than that, but not much less than that.
你们一起做作业的时候,我希望作业不会消耗你们那么多时间,比20小时少点就行了呗
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