middle stratum的用法和樣例：
例句
- The special status of the middle class in the social structure determines their eclectic values.
中間階層是社會利益結構中的緩衝層。 - When the social structure has undergone a period of annexing, the middle class in our country is coming into shape gradually while developing quickly.
在社會分層結構進一步分化整合之時，我國的中間階層也正醞釀成形，並逐步發展壯大。
