staple是可数名词还是不可数名词
staple可以作名词和动词。但作名词时该词是可数名词。 （1）a small piece of thin wire that is pushed into sheets of paper and bent over to hold them together订书钉 （2）a small U-shaped piece of metal with pointed ends, used to hold something in place U型钉 （3）a food that is needed...