key

He searched his pockets but couldn't find the key to the front door.

(Chinese) 他摸遍了口袋，但没找到前门的钥匙。

Insert the key into the ignition to start the car's engine.

(Chinese) 将钥匙插入点火开关以启动汽车发动机。

Press the 'Enter' key to submit your login information.

(Chinese) 按“回车”键提交你的登录信息。

A standard piano has eighty-eight black and white keys.

(Chinese) 标准钢琴有八十八个黑白键。

Communication is a key factor in building a strong relationship.

(Chinese) 沟通是建立稳固关系的关键因素。

The witness provided key evidence that helped solve the crime.

(Chinese) 证人提供了有助于破案的关键证据。