4 sentences for 敗 (bài — lose)

1. 胜败乃兵家常事。

   shèng bài nǎi Bīng​jiā cháng​shì.

   Victory and defeat are common outcomes for a general.

   Source: Dong Chinese Dictionary

2. 胜不骄，败不馁。

   shèng bù jiāo, bài bù​něi.

   Not conceited in victory, nor discouraged in defeat.

   Source: Dong Chinese Dictionary

3. 东方不败是金庸小说中的著名人物。

   Dōng​fāng bù bài shì Jīn Yōng xiǎo​shuō zhōng de zhù​míng rén​wù.

   Dongfang Bubai is a famous character in Jin Yong's novels.

   Source: Dong Chinese Dictionary

4. 这种永不言败的精神，正是他走向成功的关键。

   zhè zhǒng yǒng bù yán bài de jīng​shén, zhèng​shì tā zǒu​xiàng chéng​gōng de guān​jiàn.

   This never-say-die spirit is precisely the key to his success.

   Source: Dong Chinese Dictionary