Because elements are so fundamental to our study of chemistry, we find it use- "ful to refer to them in a shorthand form. Each element can be represented 由 a" chemical symbol made up of one 或者 two letters derived from the name of the element.
...One of the few parts of this textbook that is easy to understand.
well I honestly hate 阅读 so there is a magazine besides me nd on pg 18 there is a pic of smoking hot girls *,* nd under there is just some mumbo jumbo about skin care blah blah. .. but loving the hotties above ;]