If less productive opportunities are exploited by farmers before productive ones, something else is wrong . 如果农民选取的不是效益较大的机会而是效益较小的机会，那就是其他某些地方出了问题。
Failure to grow well, poor productivity and short productive life will suggest the possible occurrence of a number of chronic diseases . 生长不良、生产力低以及生产期短促意味着有可能产生许多慢性疾病。
Cocksfoot is one of our deepest rooting grasses and, judged purely on a dry-matter basis, it is also one of our most productive species . 鸭茅草是扎根最深的一种草，纯粹从干物质角度判断，也是我们最丰产的草种之一。
Small differences in growth rates, if they are sustained over many years, can make large differences in the productive potential of an economy . 增长微小的差距如果持续多年，就可以造成一个国家生产潜力上的很大差距。
Science and technology constitute the primary productive force 科技是第一生产力
I spent a very productive hour in the library 我在图书馆里的这一小时收获很大。
Give more productive enterprises the power to engage 给更多的生产企业自营出口权
Here ’ s to long and productive cheers for you both 祝你们俩幸福长久，多子多孙。
