phrase, idiomatic
to nullify all the advantages; to waste all efforts made (syn.) 前功尽弃, 前功盡棄
戰爭歷史中有在連戰皆捷之後吃了一個敗仗以至全功盡棄的，有在吃了許多敗仗之後打了一個勝仗因而開展了新局面的。
战争历史中有在连战皆捷之后吃了一个败仗以至全功尽弃的，有在吃了许多败仗之后打了一个胜仗因而开展了新局面的。
zhàn zhēng lì shǐ zhōng yǒu zài lián zhàn jiē jié zhī hòu chī le yī ge bài zhàng yǐ zhì quán gōng jìn qì de ， yǒu zài chī le xǔ duō bài zhàng zhī hòu dǎ le yī ge shèng zhàng yī né r5 kāi zhǎn le xīn jú miàn de ． In the history of war, there are instances where defeat in a single battle nullified all the advantages of a series of victories, and there are also instances where victory in a single battle after many defeats opened up a new situation.
Examples (Wiktionary)
Mandarin
战争历史中有在连战皆捷之后吃了一个败仗以至全功尽弃的，有在吃了许多败仗之后打了一个胜仗因而开展了新局面的。
戰爭歷史中有在連戰皆捷之後吃了一個敗仗以至全功盡棄的，有在吃了許多敗仗之後打了一個勝仗因而開展了新局面的。
zhàn zhēng lì shǐ zhōng yǒu zài lián zhàn jiē jié zhī hòu chī le yī ge bài zhàng yǐ zhì quán gōng jìn qì de ， yǒu zài chī le xǔ duō bài zhàng zhī hòu dǎ le yī ge shèng zhàng yī né r5 kāi zhǎn le xīn jú miàn de ．
In the history of war, there are instances where defeat in a single battle nullified all the advantages of a series of victories, and there are also instances where victory in a single battle after many defeats opened up a new situation.