e reduced 被减少
但这里不应该是被动语态,非人为造成的,而是干旱等自然因素,应用主动式.
旧的新闻可以看到：气象局:鄱阳湖洞庭湖因干旱面积减少约2/3
Poyang lake and Dongting lake's area
为何只有Dongting lake用所有格而Poyang lake不用?
最好说成 the area of Poyang lake and Donting lake
所以建议改为：
The area of Poyang lake and Donting lake has reduced by two thirds by 2011.