Her goal was to test their effectiveness against laboratory cultures of a variety of disease-causing parasites, with the aim of isolating any active principles they might contain.

她的目标是测试它们对实验室培养的各种致病寄生虫的有效性，目的是分离出它们可能包含的任何活性成分。

It was an extremely romantic feeling, delicate as an aroma, capable of quickening to an active principle, or dying to " a painless sympathy, " as the case might be.

这是一种极其浪漫的感觉，像香气一样细腻，能够加速一种积极的原则，或者死于“无痛的同情”，视情况而定。

For instance, when faced with a challenging problem or task, we can apply active learning principles by breaking it down into smaller, manageable parts, seeking different perspectives, and engaging in hands-on experimentation.

例如，当面临具有挑战性的问题或任务时，我们可以应用主动学习原则，将其分解为更小、易于管理的部分，寻求不同的观点，并进行动手实验。