如题，分点概括，不要求很多。每点下面5句话就OK。
How many points?
Two cultures with four results: A or B or both or neither.
One can only communicate in one culture, A or B.
If one communicates in A with anything from B, that is the barrier.
If one communicates in B with anything from A, that is the barrier.
There is no intercultural anything, but only monocultural anything.
If one from culture A lives in culture B, one has to become a person living in culture B to communicate without barriers.
It all depends whether one wants to be an A-culture person, or a B-culture person.
It is extremely difficult to be both.
Conclusion.