a flock of geese/ birds/ pigeons/ducks/ visitors/ customers...

dozen 一打

a dozen (of) pencils/eggs/red roses... 

gross 一 罗

a gross of nails/pencils/ can openers...

pile 一大堆

a pile of what-ifs 一大堆假定 

mound 一大堆

a mound (mouthful) maybes 满嘴的可能 

clump —群

a clump of islands/buildings 

school流派

the school of traditional grammar 

train 一列

a train of cars 一列火车厢 

pot —锅

a pot of soup/tea/water... 

fleck 片

a fleck of snow...