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。

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。