Trial and error是什么意思呀？？？

(by/through) trial and error

试错法、反复试验、不断摸索

(以得出最佳效果)

I learned most of what I know about gardening through trial and error. 

我大部分的园艺知识都是通过反复摸索得来的。

There's no instant way of finding a cure - it's just a process of trial and error. 

要找出对策是没有速成的办法的，都是一个反复试验的过程。

Olivia为大家送上的视频

https://v.qq.com/txp/iframe/player.html?vid=o1331gyzx2l&width=500&height=375&auto=0