KWIC

例句：

1. 1. This is the key to unlocking the door.
   这是打开这扇门的关键。
2. 2. The key to success lies in hard work and dedication.
   成功的关键在于努力和奉献。
3. 3. The key to solving this problem is to identify the root cause.
   解决这个问题的关键是找出根本原因。