yī​tuán

a ball of

一团 一團 yī​tuán
a ball of nounadjective
A ball, lump, or mass of something; can also describe people tangled or huddled together.

She crumpled the letter up into a ball and threw it on the fire.

a burst of
A burst, puff, or cloud of something like smoke, air, or even a particular feeling or atmosphere.
regiment
A single regiment of soldiers.