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ttuces)
在做成吃的前,一棵棵时是可数的
An edible plant, Lactuca sativa and its close relatives, having a head of green and/or purple leaves.
变成一片片时,变成吃的时就不可数了
(uncountable) The leaves of the lettuce plant, eaten as a vegetable; as a dish often mixed with other ingredients, dressing etc.
I’ll have a ham sandwich with lettuce and tomato.
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