What is the problem in this article supplements the information in writing, as I don't know the terminology and abbreviations for words that indicate certain backpack in a sentence?
What are the problems in studying this chapter. The information in writing, not the key vocabulary words. And finding words that bordered indication in the sentence.
What are the problems in learning this chapter is Not knowing the information in writing, such as abbreviations. Vocabulary and vocabulary are finding important performance indicator to tell in a sentence.