学习新软件时，通常要通过反复试验才能发现其所有功能。

When learning a new software, it's often a process of ___trial ___and ___error to discover all its features.

许多育儿技巧是通过反复尝试获得的，而非正式指导。

Many parenting skills are acquired through ___trial ___and ___error, rather than formal instruction.

那位科学家的突破是通过坚持不懈的反复试验取得的，而非突然的灵感。

The scientist made the breakthrough through persistent ___trial ___and ___error, not sudden inspiration.