external word的用法和样例：
例句
- The history of English lexical expansion is one that is characterized with heavy borrowing and word formation.
英语词汇增加的历史特点是大量地借用外来词和通过构词法构成新词。 - Start by learning to recognize the foreign word, quizzing yourself on the English translation.
开始先学习认识外来词，按英语的翻译考问自己。
