instruction:
Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
question:
Sentence1: bacteria cause food to spoil. 
Sentence2: Food poisoning occurs when spoiled food is eaten.
answer:
spoil


question:
Sentence1: All photos are digital images. 
Sentence2: satellites are used to take photos from space.
answer:
photos


question:
Sentence1: keeping food cold is used for keeping food fresh. 
Sentence2: Keeping things cold in a fridge is a way to adequately store them.
answer:

cold