By seeing how much plastic the red-eared sliders from the U.C. Davis Arboretum are swallowing, he can get an idea for how much plastic the native western pond turtles may be ingesting as well.

通过查看来自 U.C. 的红耳滑块有多少塑料。 Davis Arboretum 正在吞咽，他也可以了解本地西部池塘龟可能摄入了多少塑料。