practice的形容詞是？

　　It takes a lot of practice to play the violin well.

　　拉好小提琴需要多加練習。

　　Skill comes only with practice, patience, and persistence.

　　只有通過練習、耐心和堅持不懈才能獲得技能。

　　In practice, however, such an attitude is counterproductive.

　　然而在實際中，這種態度會適得其反。

　　Educational practice is liable to sudden swings and changes.

　　教育實踐活動易出現突然的轉向和變化。

　　His hands were rough and callused, from years of karate practice.

　　他的雙手由于多年的空手道練習，粗糙而布滿老繭。