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With the development of science and technology the telephone will serve people even better. 随着科学技术的日益发展，电话将会给人类提供更好的服务。 Every city has a closely-knit telephone network. 每个城市都有一个紧密联系在一起的电话网络。 Mobile phones are much more convenient than the fixed phones. 移动电话比固定电话方便得多。 By contrast, letter-writing is a formal way of communication: most of important notifications, such as those of acceptance, are made by letters. 相比较而言，写信是一种正式的交流方式：大多数像大学录取通知书这样的重要通知，都是使用写信的方式。 Also, every letter communication has a record and can be kept for further reference when needed. 再者，每一份信件往来日后一旦需要，都有案可查。 Yet, here again there is a disadvantage in it: it may take weeks for a letter to lead your information to a far destination. 然而，写信也有不足之处：那就是路途花费的时间太长。 Therefore, both ways of communication have their own strengths and weakness, just as everything is two-sided. Personally, we should not overestimate or deny either of them. The most important thing is to know when to use the telephone or the letter to produce the best effect. | 
