knack

Compared meaning: a skill or trick for doing something well (noun).

比较义项：诀窍、技巧（名词，指做某事的窍门或本领）。

• hang

  Almost always appears in the fixed phrase 'get/have the hang of something'; informal, and describes a skill gained gradually through practice rather than natural talent.

  几乎只出现在固定短语「get the hang of something」中，语气比较口语化，强调通过练习逐渐掌握某项技能，而非天生的天赋。

  It took her a week to get the hang of the new keyboard.

  她花了一个星期才掌握这个新键盘的窍门。

• knack 本词

  Used more freely, as in 'a knack for' or 'the knack of', and often suggests an easy or even natural talent rather than something learned slowly.

  用法更加自由，如「a knack for」「the knack of」，且往往暗示一种轻松甚至天生的天赋，而不是慢慢学会的本领。

  He has a knack for making people feel welcome.

  他很有让别人感到自在的本领。

Both mean a skill for doing something well. Hang appears almost only in 'get/have the hang of'; informal, learned slowly through practice. Knack is used more freely, as in 'a knack for', and often suggests a natural talent, not just practice.

这两个词在「诀窍、技巧」这一义项上意思相近，但用法不同：hang几乎只出现在固定短语「get the hang of」或「have the hang of」中，语气口语化，强调通过练习慢慢掌握某项技能；knack用法更自由，可以说「a knack for」或「the knack of」，也常暗示一种天生的本领。这里不比较hang的「悬挂、垂挂」义。