practising

adj.从事活动的，开业的

If you can stick at practising for long enough, you could play the piano quite well. 如果你能长期坚持练习，那么你的钢琴会弹得很好。

She's practising (a new piece) on the piano. 她在练习弹奏(一支新曲)子.

I haven't been practising enough. 我练习得还不够。