tā / men / yòng / dí / zi / hé / gǔ / zhēng / hé / zòu / le / yī / qǔ / èr / chóng / zòu / pèi / hé / fēi / cháng / mò / qì

他们用笛子和古筝合奏了一曲二重奏，配合非常默契。

They performed a duet with flute and guzheng, showing wonderful默契 in their collaboration.