小技巧：段内类比
段内结构：主题句+扩展+古人的例子+类比到现代人
Group work is the most efficient way to accomplish tasks.
主题句：合作是完成工作的最高效方式。
Cooperation comes out of human instinct, which is evolved as the most effective way to live. Human beings are gregarious animals. By cooperating with each other, human beings can achieve highest efficiency.
扩展主题句
Tracing back to ancient times when our ancestors still lived in caves, they had already known division between different labors can be the most helpful for resisting attacks from other animals and getting enough food to avoid hunger.
举古人例子，只有合作，他们才能生存。
Similarly, when students are group-studying a project, those who are good at presentation could be responsible for making the PowerPoint slides while those who are quick at calculating could help the team effectively by doing the math part. When everyone in the group shares his/her talent, the project will be finished fast and well.
类比到学生身上，只有合作，他们的school work才会高效完成。
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