千百万儿童因饥饿致死或因蚊虫叮咬而夭折，就意味着我们未能在这个世界上履行自己的责任。
When millions of children starve to death or perish from a mosquito bite, we're not doing our duty in the world.
然而，许多非洲人认为，大家庭是这个大陆的一种保险形式。据联合国儿童基金会说，那里六分之一五岁以下的孩子夭折。
But many Africans believe large families are a form of insurance on continent where one in every six children dies before the age of five, according to UNICEF.
伯克利大学能源小组的Daniel Kammen曾在撒哈拉以南非洲地区的几个炉具项目中工作过，他说许多炉具项目都在这个测试上夭折了。
A lot of the initial stove projects failed this test, says Daniel Kammen of Berkeley's Energy Resources Group, who has worked on several stove projects in sub-Saharan Africa.
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