考点：当代英语发展的现状
New words sweep in at a rate much faster than any other period in the history. Three main sources of new words: Rapid development of science and technology; Social economic and political changes; Influence of other cultures and languages. 4. Modes of Vocabulary Development 词汇发展的方式
考点：词汇发展的3个主要方式 创造新词，旧词新意，借用外来语。 各种方式的地位和作用
① Creation 创造新词: By using the existing materials, namely roots, affixes and
other elements. Most important way of vocabulary expansion.
② Semantic Changes 旧词新意：Old form takes a new meaning to meet the new
needs. Enrich the vocabulary by creating more new usages of the words.(not increase the number of words)
③ Borrowing 借用外来词：Vital role in the development of vocabulary, particular
in earlier times.
