adj.從事活動的，開業(yè)的

If you can stick at practising for long enough, you could play the piano quite well. 如果你能長期堅持練習(xí)，那么你的鋼琴會彈得很好。

She's practising (a new piece) on the piano. 她在練習(xí)彈奏(一支新曲)子.

I haven't been practising enough. 我練習(xí)得還不夠。