The study showed that those who had worked as boys enjoyed happier and more productive lives than those who had not.

研究表明，那些小时候工作过的人比那些没有工作过的人生活得更快乐、更有成效

More productive farmers have been able to provide cheaper food.

生产力更高的农民们已能提供更便宜的食品。

Recent studies show that we are far more productive at work if we take short breaks regularly.

最近的研究表明，如果我们定期地小憩一会，工作效率会更高。

It is probably more productive—for the time being, at least—to engage at the lower and midlevels.

在目前更有成效的也许是在中下层的接触。

Happy people are more productive.

开心的人工作更加富有成效。