我们通过反复试验学会了如何使用这个软件。

We learned how to use the software through ___trial ___and ___error.

掌握一门新语言通常需要大量的反复试验。

Mastering a new language often involves a lot of ___trial ___and ___error.

科学进步很少是线性的；它通常是由反复试验推动的。

Scientific progress is rarely linear; it's often driven by ___trial ___and ___error.