a display of power/courage/force/ learning/skill...

attack 一疾病的发作

an attack of fever/malaria...

group组；群；批

a group of students...

team队；组

a team of experts/footballers/scientists...

gang帮；伙；群；队；组 

a gang of four/thieves/robbers... 

army 大群；队

an army of beggars/ants/bees...

troop群;伙 

a troop of soldiers... 

host大群

a host of friends,/ heroes ... 

pack群；伙

a pack of liars/thieves/rascals/hounds... 

band帮；伙

a band of music ( players}/brigands...

choir对；组；群 

a choir of singers...

bunch串；束；挂；群；帮；伙.

a bunch of bananas/fools/flowers/keys/thieves...

bouquet 束：把