v.解開；松開；取消

Would you please undo this knot for me? 你能不能幫我把這個(gè)結(jié)解開？

He tried to undo the knot by picking at it with his fingers. 他用手指不停地扯，想把繩結(jié)解開。

To return a database to its state as of the last committed change, i.e., to undo recent uncommitted changes. 使一個(gè)數(shù)據(jù)庫返回到它上次已確認(rèn)的改變之后的狀態(tài)，即取消最近的尚未確認(rèn)的變動(dòng)。

A compensating transactions:學(xué)報(bào)；會(huì)報(bào)." target="_blank">transaction means that a new transaction will undo the effects of previous transactions. 補(bǔ)償事務(wù)的意思是一個(gè)新事物會(huì)用于取消前一個(gè)事務(wù)的所有效果。

undo指將原本捆綁著的東西打開,如鞋帶、包裹等,即“松開,解開”,主要強(qiáng)調(diào)解開的動(dòng)作,而不強(qiáng)調(diào)解開的狀態(tài)。引申可指“毀壞,敗壞”。

undo多用作及物動(dòng)詞,后接名詞或代詞作賓語。可用于被動(dòng)結(jié)構(gòu)。

undo的過去式是undid,過去分詞是undone。