379. The reason why so many children like to eat this new brand of biscuit is that it is particularly sweet and crisp.
the reason why...是表示原因的固定句型，其中的why不可以用that替换。如：
The reason why I did it is obvious.
The reason why he was late was that he was ill.
The reason for his being late was that he was ill.
I'll do anything in reason to help you.
by reason of意为“由于”。如：
He was excused by reason of his age.
by reason that意为“因为”。如：
He looks down on us by reason that we are poor.
reason sb. into doing sth。意为“通过讲道理使某人做某事”。如：
The doctor reasoned his patient into quitting smoking.