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1.withdraw v. 撤退；撤走；拿走；（从银行）取（钱）
例句：He stated that all foreign forces would withdraw as soon as the crisis ended.
他声明危机一结束，所有外国军队都将撤离。
2.invaluable a. 无价的；极有用的；极宝贵的
例句：The book is an invaluable aid to teachers of literature.
这本书对于教授文学的老师来说帮助非常大。
