231.expand [ɪk'spænd] v. 扩大，扩张；展开，膨胀
例句：Water expands as it freezes. 水结冰时会膨胀。
232.expansion[ɪkˈspænʃn]n. 扩大，扩充；发展，膨胀
例句：The rapid expansion of cities can cause social and economic problems. 城市规模的迅速扩大会带来各种社会和经济问题。
233.expel[ɪk'spel]v. 驱逐，开除，赶出
例句：Two girls were expelled from school for taking drugs. 两名女生因吸毒而被学校开除。
234.expend[ɪk'spend]v. 消费
例句：People of different ages expend different amounts of energy. 不同年龄的人消耗的能量有所不同。
235.expenditure[ɪkˈspendɪtʃə(r)]n. 支出，消费；经费
短语：the expenditure of time and money on your house or garden 你在房子或花园上所花费的时间和金钱
236.expense[ɪk'spens]n. 开销，费用
例句：Conference rooms were equipped at great expense. 装备会议室花费巨大。
237.exploit[ɪk'splɔɪt]v. 剥削；利用，开采n. 功绩, 勋绩
例句：Homeworkers can easily be exploited by employers. 在家工作的人容易被雇主剥削。
238.explore[ɪk'splɔː]v. 勘探；探讨
例句：Management need to explore ways of improving office security. 管理层需要探讨如何加强办事处的安全措施。
239.explosion [ɪk'spləʊʒn] n. 爆炸；爆发；激增
例句：A massive explosion ripped through the building. 强烈的爆炸严重损毁了大楼。
240.extent [ɪk'stent] n. 程度，范围，大小，限度
例句：They examined the extent to which (= how much ) age affected language-learning ability. 他们调查了年龄会在多大程度上影响语言学习能力。
