养狗的机会成本不单单是买狗所花的费用，还包括狗粮、请兽医、清洁地毯，和花费在遛狗上的时间。
The opportunity cost of apuppy includes not just the purchase price of the puppy, but also the food,veterinary bills, carpet cleaning, and the value of the time spent dealing withthe puppy.
养狗的机会成本不单单是买狗所花的费用，还包括狗粮、请兽医、清洁地毯，和花费在遛狗上的时间。
The opportunity cost of apuppy includes not just the purchase price of the puppy, but also the food, veterinary bills, carpet cleaning, and the value of the time spent dealing withthe puppy.
养狗狗的时候，你肯定预料到要花点钱在狗粮、兽医，甚至磨牙玩具上。
When you adopt a dog, you expect to drop some cash on things like food, visits to the vet, and maybe chew toys.
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