帮我翻译一下下面两段文字，拒绝机译；50分作为酬谢.
世上有透光镜，镜背面有铭文，共二十字，字体极其深奥，没人能读懂。用这个镜子承受日光，背面的花纹和二十个字就会透射在房壁上，清清楚楚。有人推究它的原理，认为是由于铸造时薄处先冷，唯独有花纹和字的地方比较厚，冷得慢，以致铜收缩得多。铭文和花纹虽然在背面，但是镜面上隐隐约约有痕迹，所以在光中显现出来。我观察了这面镜子，认为道理确实如此。可是我家有三面镜子，又见到了别人家所收藏的镜子，都是一个式样，图案铭文没有丝毫差异，形制很古老。只有这种镜子可以透光，其他的镜子虽然也有很薄的，却都不能透光。想来古人自有特殊的制作方法。
这是古代的科技文，呵呵
Major in pharmaceutical preparation , I graduated from the pharmacy school of XX university of TCM in July,2009.I am a girl with the character of hardworking, honest,and optimistic.What's more, all of my friends trust me. Taking my characteristics of personality into consideration, I chose the field of Drug sales whether to practice or to work.My first job was working as a probational store manager in the Chain Co., Ltd. of XX Pharmacy. I had ever been worked as salespersons, cashiers and so on, which provide me with different experiences.My second job,which acquainted me with the medical sales process in the hospital, coincides with the post you required of. After one year's practice and experience, I can now communicate with custommers more easily and deal with the emergency skillfully.
As a result,sales achievement of our company increased 50 percent. I like Yuan Yiping, and want to be a person like him one day~
What has impressed me most is the application of the internet in our daily life, as the development of it , especially the development of the e-commerce which has provided us with a better and faster platform.Thus we don't have to go out but be able to purchase any thing that we want. Time and efficiency have been greatly increased. However, a lot of troubles have been brought to us at the same time. Such as the leak of personal information, junk mails, even many kinds of frauds. All these have made me understand that changes are the sword with two blades, which means it can not only brings you convenience but also the following unnecessary inconvenience."
2. "Dear classmate,
How are you! It has been a long time since last time we heard from each other. And I do not know how things are going with you. I still remember the time when we were in the middle school, we went to school and back home together. You were always my model and you took care of me in many aspects, helping me with my Chinese and revision of Maths. It were just like yesterday whenever I recall it.
Recently , I have been studying English but I have no idea how. You obtained an excellent English result in our class at that time and I hope you can introduce some experience of English studies to me, with which I will be able to improve within a short period of time but not to waste my time."
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