This is the 2029th most frequent Chinese word.
钥匙
Key.
In this sentence, '钥匙' is used to refer to a physical object, a tool used to unlock or lock something.
这把钥匙可以打开门。
This key can open the door.
Here, '钥匙' is metaphorically used to indicate something essential or crucial for achieving an outcome.
成功的钥匙是坚持不懈。
The key to success is perseverance.
'钥匙' refers to an object left behind, indicating its possession and location in a specific context.