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note：
1.withdraw vt. 取出，撤退，收回
deposit and withdraw 存钱和取钱
American military had to withdraw its force form Vietnam battlefield to avoid worse result.为了避免更坏的结果，美国军队不得不从越南战场上撤退。
2.fill in 填写，填充，临时替代
3.exchange n.兑换，替换，交换
exchange for cash 兑换纸币；exchange students国际交换生
