sentences: a refrigerator is used for keeping food fresh for a long period of time
docs: electric_refrigerator is refrigerator. keeping_newspaper is taking_care_of. cooler is refrigerator. fridge is refrigerator. mini_fridge is refrigerator. beverage_refrigerator is refrigerator. fridge is place. refrigerator is machine. saving_money is keeping. used_thing is consumer_durable.