self-training

例句：

1. 1.She decided to take up self-training in martial arts after retirement.
   退休后，她决定开始学习武术进行自我训练。
2. 2.He believes that self-training is the key to success in life.
   他认为自我训练是成功的关键。
3. 3. The program offers a wide range of self-training options for people of all ages and abilities.
   该计划为不同年龄和能力的人们提供了广泛的自我训练选项。