应该是the linear relationship between the change of A and that of B
the change of A and that of B=the change of A and the change of B
而 the change of A and B有歧义:1. A 和B可被认为一个事物,如此,前面的relationship就不可解了。2. the change of A是一个东西,而另一个东西是B,而不是the change of B.