What book? There are many different books named ambush.
Do you mean Tim O'Brien
I sentence that contains an element of bias could be one that states an opinion. For example, "I think her shoes are ugly, mine are better." the person talking is biased because they really like their shoes.
Answer:
Mother tounge is basically just the language from your culture.
Explanation:
When somebody says something is in their "mother tounge" it means it is in their native language. For example, "The Sioux man recited a poem in his mother tounge, his face alight with passion."