Unfortunately, rich countries possess most of this knowledge, while developing countries do not.
不幸的是，发达国家掌握了这方面的大部分知识，而发展中国家则没有。
People in developing countries are happier than before while people in developed countries are no happier than they used to be. Why? What lesson can you learn from it?
话题好像是问为什么在已开发的富国人民不如以前快乐，而相对的，在开发中的人民却是比以前快乐?又问从这种情形学得什么教训?。
While people in other countries in the world were trying to catch wild animals and birds and were still collecting seeds and nuts, farmers in China were developing the science of agriculture.
当别的国家的人们还在努力捕猎禽兽、采集果实时，中国的农民就已经在从事农业研究了。
While people in other countries in the world were trying to catch wild animals and birds and were still collecting seeds and nuts, farmers in China were developing the science of agriculture.
当别的国家的人们还在努力捕猎禽兽、采集果实时，中国的农民就已经在从事农业研究了。
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