丹心

例句：

1. 1. He always shows his true feelings with his sincere heart.
   他始终用他的真诚之心表达真实情感。
2. 2. The old man's unwavering loyalty is a shining example of true dedication.
   那位老人坚定不移的忠诚是真正的奉献的光辉榜样。
3. 3. Her deep love for her country was evident in her unwavering dedication to her work.
   她对国家的深厚爱意在她的不懈工作奉献中显而易见。