tā / men / zài / kùn / nán / shí / qī / yì / qǐ / gòng / huàn / nàn / gǎn / qíng / biàn / de / gèng / jiā / shēn / hòu

他们在困难时期一起共患难，感情变得更加深厚。

They went through hard times together, which deepened their relationship.