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1 There was a decrease in the number of full-time teachers from 5 million in 1960 to 3 million in 1962, the bottom of those given years.
2 The number of full-time teachers declined from 5 million in 1960 to
3 million in 1962, the bottom of those given years.
3 The years between 1960 and 1962 witnessed that the number of full-time teachers declined from 5 million to 3 million, the bottom of those given years.=句型2
4 China witnessed that.+句型2
范文：
总体趋势
According to the figure, although there were some fluctuations in earlier years, the overall trend tended to indicate the increasingly growing number of teachers from 1960 to 1990.
There was a sharp decrease in the number of teachers from five million in 1960 to three million in 1962, the bottom of those given years, which was followed by a rapid increase over the next two years. The number dropped again from almost six million in 1964 to five million in 1966 and then went up gradually until 1976 when there was a leveling off at eight million for the next ten years. The years from 1986 to 1990 saw a steady rise in the number of teachers, while 1990 saw the peak of 10 million.