zhuō / shàng / fàng / zhe / jǐ / chuàn / yào / shi / bù / zhī / dào / nǎ / yī / chuàn / shì / nǐ / de

桌上放着几串钥匙，不知道哪一串是你的。

There are several strings of keys on the table, but I do not know which one is yours.