在过去5年，这些村庄的庄稼收成翻三番。
In the past five years, Sanchez said crop yields in the Millenium Villages have about tripled.
而这样的增长可以让现有受保护的珍稀植物的种类翻三番。
Such an increase could triple the number of types of rare plant in the preserves.
大约450万美国人患有ad，并且随着美国人口的老龄化，数字将要在2050年翻三番。
Roughly 4.5 million Americans have Alzheimer's disease, and that number is expected to triple by 2050 as the U. s. population ages.
据估计，未来20年农产品产值潜在着翻三番的可能，可以从现在的两千八百亿美元提高到2030年的八千八百亿美元。
It has also been estimated that agricultural production could potenitally grow more than three-fold over the next 20 years, rising from $280bn today to $880bn by 2030.
亚洲开发银行周四发表的一研究报告说，汽车销售的剧增将使亚洲交通业所带来的二氧化碳排放量在未来的25年内翻三番。
Soaring car sales will drive a tripling of carbon dioxide emissions in Asia from transport over the next 25 years, according to a study released on Thursday by the Asian Development Bank.
亚洲开发银行周四发表的一研究报告说，汽车销售的剧增将使亚洲交通业所带来的二氧化碳排放量在未来的25年内翻三番。
Soaring car sales will drive a tripling of carbon dioxide emissions in Asia from transport over the next 25 years, according to a study released on Thursday by the Asian Development Bank.
应用推荐