knack
/næk; næk/ n[sing]
1 skill at performing some special task; ability 技巧; 诀窍
Making an omelette is easy once you've got the knack (of it). 一旦你掌握了煎蛋饼的技巧, 做起来就很容易了.
There's a knack in/to locking this door which takes a while to master. 锁这门要有窍门, 得用些时间才能学会.
I used to be able to skate quite well, but I've lost the knack. 我从前滑水滑得很不错, 可现在没有这本事了.
2 ~ of doing sth (often annoying) habit of doing sth （常招人厌烦的）毛病, 习惯
My car has a knack of breaking down just when I need it most. 我的汽车总是在我最需要的时候抛锚.