all by himself

• 独自地

all by himself的用法和样例：

例句

1. He did it all by himself!
   他独自一人做了这件事。
2. That boy is in a world all by himself. He never knows what is happening around him.
   那男孩总是只顾自己，从不知道周围发生的事情。
3. He lives all by himself in that large house.
   他独自一人住在那所大房子里。
4. He is calmest (=very calm) when he is all by himself.
   他一人独处时极为平静。