the fire started in the basement and quickly spread to the first floor where it destroyed all the furniture and equipments in the lab.all the furniture and equipments ,为什么equipment 加sit指什么

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thefirestartedinthebasementandquicklyspreadtothefirstfloorwhereitdestroyedallthefurnitureandequipmen

the fire started in the basement and quickly spread to the first floor where it destroyed all the furniture and equipments in the lab.all the furniture and equipments ,为什么equipment 加sit指什么
the fire started in the basement and quickly spread to the first floor where it destroyed all the furniture and equipments in the lab.
all the furniture and equipments ,为什么equipment 加s
it指什么

the fire started in the basement and quickly spread to the first floor where it destroyed all the furniture and equipments in the lab.all the furniture and equipments ,为什么equipment 加sit指什么
furniture是不可数名词,equipment 是可数名词

当其表示单件的装备时可数,equipments

equipment是可数名词。 furniture是不可数名次所以不加