Learner's definition of KNACK
[singular]
: an ability, talent, or special skill needed to do something技能；本领；技巧—
usually + for or of -
They have a knack for telling interesting stories.他们有本领，善于讲有趣的故事。
-
Once you get the knack of riding a bicycle [=once you learn how to ride a bicycle], you'll never lose it.你一旦掌握骑自行车的技巧，就再也不会忘掉。