chosen-cipher text attack

例句：

1. 1.The team has chosen a new coach for the upcoming season.
   球队为即将到来的赛季选择了新的教练。
2. 2. She chose to live in a small town instead of a big city.
   她选择住在一个小城镇而不是大城市。
3. 3.He chose his words carefully to avoid offending anyone.
   他仔细选择他的言辞以避免冒犯任何人。