昔日的对手，如今成了最信任的合作伙伴。

Xírì de duìshǒu, rújīn chéng le zuì xìnrèn de hézuò huǒbàn.

The rival of the past has now become the most trusted partner.

他走进母校，仿佛又回到了昔日的学生时代。

Tā zǒujìn mǔxiào, fǎngfú yòu huí dào le xīrì de xuéshēng shídài.

He walked into his alma mater and felt as if he had returned to his student days of the past.

翻看旧照片，一幕幕昔日的场景又浮现在眼前。

Fānkàn jiù zhàopiàn, yí mù mù xīrì de chǎngjǐng yòu fúxiàn zài yǎnqián.

Looking through old photos, scenes from the past reappeared before my eyes one by one.