kùn / nán / suī / rán / bù / shǎo / dàn / wǒ / men / bù / néng / zài / zuì / hòu / guān / tóu / dǎ / tuì / táng / gǔ

困难虽然不少，但我们不能在最后关头打退堂鼓。

Although there are many difficulties, we cannot give up at the last moment.