Definition: to happen again or start to exist again Level: B2
如果症状复发，你必须去看医生。
You must see a doctor if the symptoms ___return.
她冷静下来后，信心慢慢恢复了。
After she calmed down, her confidence slowly ___returned.
在经历了长期的困难之后，乐观的感觉又开始出现了。
The feeling of optimism began to ___return after a long period of difficulty.
