A swirl of sand filled the air around them.

他们周围的空气中弥漫着沙涡。

Then, the researchers added tiny packets — each about the size of a grain of sand — filled with a second chemical that works as a curing agent, called DMDNT.

研究人员在这些像沙粒大小的胶水包中添加了这种化学物质作为固化因子，叫做 DMDNT。