liǎng / rén / zài / lǚ / tú / zhōng / jiàn / jiàn / sī / shú / chéng / le / wú / huà / bù / tán / de / péng / yǒu

两人在旅途中渐渐厮熟，成了无话不谈的朋友。

The two gradually became familiar with each other during the trip and became friends who talked about everything.