Why is there confusion as to what the Bible says about hell?

"Much confusion and misunderstanding has been caused through the early translators of the Bible persistently rendering the Hebrew Sheol and the Greek Hades and Gehenna by the word hell. The simple transliteration of these words by the translators of the revised editions of the Bible has not sufficed to appreciably clear up this confusion and misconception."—The Encyclopedia Americana (1942), Vol. XIV, p. 81.