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casual
偶然的,碰巧的;临时的;非正式的
trap
陷阱,圈套
vacant
空的,未占用的
vacuum
真空,真空吸尘器
oral
口头的,口述的,口的
optics
(单、复数同形)光学
organ
器官,风琴
excess
过分,过量,过剩
expel
驱逐,开除,赶出
expend
消费
expenditure
支出,消费;经费
expense
开销,费用
expensive
花钱多的;价格高贵的
expand
扩大,扩张;展开,膨胀
expansion
扩大,扩充;发展,膨胀