all
drop
a. 这个工厂生产的彩电已由1986年的5000台增加到1990年的21000台。
the number of colour tv sets produced by the factory increased (rose , grew , climbed) from 5000 in 1986 to 21000 in 1990.
b.参加者的人数增加到30万。
the number of paticipants grew up to 300000 persons = increased , reaching 300000 persons).
c. 这个学校的教职工人数已减少到700人。
the number of teaching staff members in this school has decreased to 700 persons.
5.（be）three times as + 形容词 + as 总产量 total output 钢的年产量 the annual output of
上升17% rise by 17per cent steel
日产量 the daily output 导致产量下降 result in a
diminished output
现在我们地区的粮食产量相当于1970年的3倍。
the grain production (= output)in our area now is three times as great as that of 1970.
6.compared with … , …
与去年相比，今年13项主要产品的产量都有大幅度增长。the factory has an output of 9 million cigarettes daily.
compared with that of last year,the output of 13 main products (= items) this year has increased to