 Some count @-@ classifiers may also be used with nouns that they are not normally related to , for metaphorical effect , as in <unk> ( yì <unk> <unk> , " a pile of worries / troubles " ) . Finally , a single word may have multiple count @-@ classifiers that convey different meanings altogether — in fact , the choice of a classifier can even influence the meaning of a noun . By way of illustration , <unk> sān <unk> kè means " three class periods " ( as in " I have three classes today " ) , whereas <unk> sān <unk> kè means " three courses " ( as in " I signed up for three courses this semester " ) , even though the noun in each sentence is the same . 
