suīrán / wǒmen / zhǐyǒu / yīmiànzhījiāo / dàn / tā / gěi / wǒ / liúxià / le / shēnkè / de / yìnxiàng

虽然我们只有一面之交，但他给我留下了深刻的印象。

Although we've only met once, he left a deep impression on me.