Many drugs were found by trial and error.

许多药物都是经过反复试验后才被发现的。

《柯林斯英汉双解大词典》

It was largely a matter of trial and error.

这主要是个反复实验的问题。

《牛津词典》

Children learn to use computer programs by trial and error.

儿童通过反复摸索才学会运用计算机程序。

《牛津词典》

And that can take a little bit of trial and error."

VOA: special.2010.08.04

In just a moment the hearts are gonna start flowing from bottom to top and the cookies are gonna start moving left and right and they seem to be somewhat synchronized with the music, perhaps based on trial and error by the student who implemented this one.

刚刚那一刻，那些爱心们从底部上浮到顶部,饼干人则向左向右移动,它们似乎都随着音乐的律动而变化着，也许这是那个制作该动画的同学,不断尝试的结果。

哈佛公开课 - 计算机科学课程节选

As a consequence, there's a lot of variability and error in these dietary measurements.

结果就是,饮食测评中会有很多变数,和误差

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

As mentioned above, some trial and error is probably going to be required here.

ENGADGET: How-to: One-click audio news, synced with your iPod in Tiger

This was a long process of trial and error, of putting together, and looking at backtesting.

FORBES: Use the RCI to Gauge Market Strength

The service certainly saves these young researchers trial and error, and therefore time and money.

ECONOMIST: More connective tissue may make academia more efficient