slough1 slough2

My first  American reader could be a yardstick for measuring the acceptance of my book, who showed moderate interest.
Therefore I have to strength the part of mental lifter, trying use "in another word".
Imagine he is driving a speeding car while looks at the high-way sign, he might not have the ability to remember so many information while the next exit is near.
So try to absorb the function of GPS:
marked directing line;
warning before a turn;
sound besides image;
Recalculate;
choices;
...