There are very strict rules on the capture, sample collection and tagging of animals set forth by numerous institutional animal care and use committees.

许多机构的动物护理和使用委员会对动物的捕捉、样本采集和标记都有着非常严格的规定。

It was likely that these rocks had somehow  fallen out of the tube during that specific sample collection, possibly once again because of  the unexpectedly crumbly nature of Martian rocks.

这些岩石很可能在特定的样本采集过程中以某种方式从管子中掉出来，这可能再次是因为火星岩石出乎意料的易碎性质。