well, the first article contains alot of technical information about radars, and my physics (and chinese) isnt that great (first year engineering student). But as far as i can make out, the book is discussing possible ways to some how manipulate the incoming radar waves from the enemy to make the friendly aircraft harder to detect. i think it is discussing the possible geometries that can minimize radar signiture.
the second part(not photo copy of book) moves on to discussing radar obsorbing materials.
the first part of the third part is explaining how a certain type of radar operates, and the the last part is again talking about minimizing radar signiture of aircraft.
Again, i am totally lacking in knowledge of this area (though not for long), and some what lacking in chinese language skillz (probably will get alot worse).