knack

My grandmother has a real knack for gardening; everything she plants grows perfectly.

(Chinese) 我奶奶在园艺方面很有诀窍；她种的每样东西都长得非常好。

Opening this old wooden box requires a certain knack; you have to push the lid while pulling the latch.

(Chinese) 打开这个旧木盒需要一定的技巧；你得在拉锁的同时按住盖子。