A1 a piece of metal that has been cut into a special shape and is used for opening or closing a lock, starting a car engine, etc.钥匙
More examples
She fumbled around in her handbag, looking for her key.
I heard someone turn a key in the lock.
Give me the car keys - you're in no fit state to drive.
She suddenly remembered (that) her keys were in her other bag.
Please hand in your keys at reception on your departure from the hotel.
B2 any of the set of moving parts that you press with your fingers on a computer keyboard, or musical instrument to produce letters, numbers, symbols, or musical notes(计算机、打字机或乐器的)键
Examples
If you press this key, the computer screen will clear .
Press and hold down the control key while you press '9'.
Press the return key twice to leave a blank line.
Use this key to toggle between the two typefaces.
He ran his fingers over the piano keys.
a set of musical notes based on one particular note调,主音
a list of the symbols used in a map or book with explanations of what they mean(地图、书等的)符号说明,图例
A2 a list of the answers to the questions in an exercise or test(练习或考试的)问题答案
B2 very important and having a lot of influence on other people or things极重要的,关键性的
More examples
I think there is one key fact that you have overlooked.
The key witness for the prosecution was offered police protection after she received death threats.
The control of inflation is a key component of the government's economic policy.
Delegation of responsibility is a key part of a manager's job.
The economy is regarded as the key factor which will determine the outcome of the general election.
to intentionally damage a car by scratching its paint using a key故意用钥匙刮花一辆车
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