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1. 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。 了解引导时间从句的三个引导词 when, while, as 的区别: while 的含义是during the time that 表示时间段或过程，强调主句与从句的行为或状态同时发生或存在，从句的谓语动词必须是延续性的。如：While I was reading, the telephone rang. 我正看书时电话响了。when 的含义是at or during that time, 既可以用于指时间一点(从句谓语需用终止性动词),也可用于指时间段(从句谓语需用延续性动词)。如：When the firefighters arrived, we had already put out the big fire. 当救火队员到来时，我们已经把大火扑灭了(前后两个动作不同时发生)。When I woke up, Mum was preparing breakfast. 当我醒来时，妈妈正在准备早餐。as 侧重的是主句和从句中的行为同时发生，通常译为随着...或一边...一边...。如: As you grow, you know more and more. 随着年龄的增长，你的知识越来越丰富。 2. He advised farmers to choose the best seed-heads, the ones that had the best colour. 他建议农民挑选最好的谷穗，即那些颜色最好的谷穗。 | 
