zhè / shǒu / liàn / xí / qǔ / bù / cháng / què / hěn / kǎo / yàn / shǒu / zhǐ / de / líng / huó / xìng

这首练习曲不长，却很考验手指的灵活性。

This etude is short, but it really tests the flexibility of the fingers.