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

"A lot of British Colombia is known for that. We're giving away smoked salmon, oysters samples, all sorts of artisan foods and cheeses.

VOA: standard.2010.02.23

One of those scientists. Kim Cecil,from the University of Cincinnati She was part of a team of researchers who took annual blood samples from several hundred lead-exposed children for more than 20 years.

VOA: standard.2009.12.19