为您解答
ttuces)
在做成吃的前，一棵棵时是可数的
Anedibleplant,Lactucasativaanditscloserelatives,havingaheadofgreenand/orpurpleleaves.
变成一片片时，变成吃的时就不可数了
(uncountable)Theleavesofthelettuceplant,eatenasavegetable;asadishoftenmixedwithotheringredients,dressingetc.
I’llhaveahamsandwichwithlettuceandtomato.
