addition thick transition area的用法和样例：
- A front is a transition area between the cold and warm air masses.
- There are 28 villages in the transition area surrounding the reserve, where the main economic activities include agriculture and pastoralism, with the recent addition of tourism.
- The superficial epithelia cells do not bind the active ingredient and thus only serve as a transit area.
- Our experi mental results show that the phenomena are coexisted in order and at random in transition area.