The new president spent the first year undoing the work of his predecessor.
新
用了第一年
时间来收拾前
留下摊子。
原因
开；取消（undoing形式）
;
;;;
;开;The new president spent the first year undoing the work of his predecessor.
新用了第一年时间来收拾前留下摊子。
She has invented a nifty little gadget for undoing stubborn nuts and bolts.
她发明了一种灵巧小工具用来松开紧固螺母和螺栓。
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