The political effect of such vehicles may be
enormous,as they can go over land and sea and
can cross most reasonable abstacles as if they
aren't there.You could have the great "ports"of
the world at the centre of the continents,if
you wanted to.我有2点疑问
第一 句话里面 为什么AS IF引导的从句是现在时aren't
第二句话 我没有明白意思 就是说跟前面的话是什么关联 跟这种VEHICLE为什么有这种了 就可以有PORT了呢