你新买的电脑出了问题，为此你写信给经理投诉。 You have bought a brand-new computer in a store. But much to your disappointment, it could not be properly operated when you got it back. Write a letter to the manager: 1) giving complaints, 2)

On competition and cooperation（辨证关系题材）

竞争与合作
When it comes to competition and cooperation, some people always emphasize competition but neglect cooperation. Their reasons run as following: to begin with, they believe only competition can help them defeat their counterparts; in addition, they think competition is the only way to lead to success.

谈到竞争与合作，有些人总是强调竞争，而忽视合作。其原因如下：首先，他们认为只有竞争才能帮助他们击败对手；此外，他们认为竞争是通向成功的唯一途径。
But some others hold different opinion. They think cooperation is as important as competition. They base their opinion on the following reasons: on one hand, cooperation can build trust between each other and help to bring long-term relationship; on another hand, cooperation can turn a small and weak business into a big and strong one.

也有人持不同的意见。他们觉得合作与竞争一样重要。他们根据他们的想法，理由如下：一方面，合作可以建立相互之间的信任并帮助建立长期的合作关系；另一方面，合作可以使一个弱小的企业变成一个强大的企业。
From what has been discussed above, we may safely draw a conclusion that both competition and cooperation are essential to success and thus should be emphasized at the same time.

通过以上讨论，我们可以得出一个结论，竞争和合作对成功都很重要，因此应同时被强调。