"The way that we do that is by putting them in tanks of water... and adding weights until they're just sinking; at which point we know they have the same density as the water that they're sitting in," said Project Leader Richard Sanders.
PELAGRA will suck ocean water with marine snow into containers and periodically bring them to the surface for detailed study.
Scientists hope that PELAGRA devices will help them answer another interesting question - why is marine snow more abundant in some parts of the ocean than in others.
Vocabulary
plankton:浮游生物(总称)
poop:粪便
phytoplankton:[植] 浮游植物(群落)
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