Definition: not easy, requiring hard work

Definition: differences in physical traits of an individual from the group to which it belongs

Definition: front matter preceding the text of a book; preface; introduction; prologue

Definition: different

Definition: to hear

Definition: to speak

Definition: uttered sounds that do not have the structure of language

Definition: again

Definition: related to building or construction

Definition: to call

Definition: before

Definition: the act of making clear or understandable

Definition: to build

Definition: clear

Definition: the choice and use of words and phrases in speech or writing.

Definition: science that studies hearing

Definition: give new life or energy to