"challenge" 是一个可数名词，其复数形式是 "challenges"。例如：
1. She faces many challenges in her work.
2. They rose to the challenge of entertaining 80 people.
3. The role will be the biggest challenge of his acting career.
"challenge" 是一个可数名词，其复数形式是 "challenges"。例如：
1. She faces many challenges in her work.
2. They rose to the challenge of entertaining 80 people.
3. The role will be the biggest challenge of his acting career.