钥匙

In a sentence

• 这把钥匙可以打开门。

  This key can open the door.

  In this sentence, '钥匙' is used to refer to a physical object, a tool used to unlock or lock something.

• 成功的钥匙是坚持不懈。

  The key to success is perseverance.

  Here, '钥匙' is metaphorically used to indicate something essential or crucial for achieving an outcome.

• 我忘了在桌子上拿钥匙。

  I forgot to take the key from the table.

  '钥匙' refers to an object left behind, indicating its possession and location in a specific context.