extend /iksˈtend/ vt. & vi. 1.伸出(手臂)，展开(翅膀)：He extended his hand in greeting. 他伸出手打招呼。A bird extends its wings when soaring. 鸟在高飞时展开双翅。2.延伸，继续: The road extends for miles. 道路延伸了好几英里。The meeting extended late into the night. 会议继续到夜里。3.延长，扩大: We extended our visit. 我们延长了访问时间。4.给予（同情、帮助等）(to): extend warm congratulations to sb. 向某人表示热烈祝贺We extended our sympathy to the family. 我们对这个家庭给予同情。
extension /iksˈtenʃən/ n. ［u］ & ［c］ 1.扩大部分，延长部分：the extension of our foreign trade 我们外贸的扩大 The school was not big enough so an extension was built on to it. 学校面积不够，又给它扩大一点。2. 延长: The pupils disliked the extension of the term. 学生们不喜欢延长学期。3.电话分机：What’s the extension number of your phone? 你电话的分机号码是多少?
extensive /iksˈtensiv/ adj. 广阔的，广泛的；广博的：Under this system, the people enjoy extensive democracy and freedom. 在这种制度下，人民享受广泛的民主和自由。 The river flooded extensive areas of the countryside. 这条江淹没了大片的农村。［考句］It is quite necessary for a qualified teacher to have good manners and extensive knowledge.一位称职的教师必须具有良好的举止及广博的知识。
