New words：

setback ['setbæk] n. 挫折；阻碍

Sample Sentences：

No setbacks can make him waver.
The patient had a setback in her recovery.
It's just a minor setback, a part of living, no big deal!

waver ['weivər] v.动摇；颤抖；犹豫不决
minor ['mainə] adj.轻微的；较小的；次要的

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