Lynn Henning samples the waters for pollution from the large livestock farms near her home in rural Michigan.

VOA: standard.2010.05.06

And these samples are used for scientific purposes.

这些样本可以用于科学目的

耶鲁公开课 - 生物医学工程探索课程节选

And these samples are used for scientific purposes.

这些样本可以用于科学目的

耶鲁公开课 - 生物医学工程探索课程节选