in considering of the above dialogue between humble meand the owner of this concurrent building which i believe that de facto para 2 3 4 status either 1) unanswered or; 2) answered but not in a logical way or; 3) the answer did not achieve a logic circuit, so i will not further discuss about the matter itself however try to concentrate humble me to something else which under general public acceptance as well as conceptualization to be learning....
concentrate*
是不是concentrate yourself on* 更常用呢?