Read and translate1.自从有了移动电话后，他再也没有给朋友写信了。译文：He has no longer written to his friends ever since he got a mobile phone.2.尽管很忙，他每天至少花两小时上网，了解这个领域的最新动态。译文：Even though he is very busy, he spends at least two hours every day surfing the Internet, aiming to know about the latest development in this area / field.3.李教授在毕业典礼上做了一个简短的讲话，他的话深深铭刻在我的记忆中。译文：Professor Li made a short speech at the commencement, his words of which were deeply impressed upon my memory.4.讲到期末考试，学生们一点儿都不紧张，他们满脸都
