Paul's father only saw him as a substitute for his dead brother.
保罗的父亲只是把他当作他死去的哥哥来看待。
《牛津词典》
2
Eliza toddled up to her father, and tried to pull the book out of his hand, and install herself on his knee as a substitute.
伊莱扎摇摇晃晃走到爸爸跟前，奋力想把爸爸手中的书拿开，然后爬上他膝头代替那本书。
3
The time and attention that a father gives to a child is irreplaceable — there is no substitute for the involvement and commitment of a responsible father.