Many new college freshmen will have to learn the hard way, by trial and error, but there is hope for those coming up behind them.

What she did from instinct, I had to learn by trial and error.

This is my do it yourself manual, that I just learned by trial and error.

We've learned much, mostly by trial and error, since then.

But networks can also learn by trial and error.

This precision is not built-in, but learned by trial and error.

His father added, "Everyone learns the sport by trial and error."

You learn by trial and error anyway, so that would have been very helpful.

So satellite buffs have to learn by trial and error.

She would have to learn by trial and error, while the luck itself kept her alive.