expansion [iksˈpænʃən] n. 扩大, 扩张, 扩展, 膨胀 Heat causes the expansion of gases. 热使气体膨胀。 扩张物, 膨胀物 His big book is an expansion of the little book he wrote before. 他这本大部头的书是在他以前写的一本小册子的基础上扩充而成的。 extension [iksˈtenʃən] n. 延伸, 扩展 The pupils disliked the extension of the term. 小学生们不愿延长学期。 增加部分 Our extension is nearly finished. 我们的扩建部分已接近完工。 电话分机 There are telephone extensions in every room. 每个房间都有电话分机。