optics n.《单、复数同形)光学organ n.器官,风琴excess n.过分,过量,过剩expel v.驱逐,开除,赶出expend v.消费expenditure n.支出,消费;经费expense n.开销,费用expensive a.花钱多的;价格高贵的expand v.扩大,扩张;展开,膨胀expansion n.扩大,扩充;发展
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