There's the expense of buying a vacuum cleaner (and keeping it in good repair), plus the extra cost of purchasing cleaning must-haves like vacuum bags, sponges, paper towels and cleansers.
比如购买吸尘器(和它保持工作良好的维修费用)，加上购买那些日常清洁必须物诸如真空袋，海绵，纸巾和清洁剂的额外费用。
By the time the machine wears out, you will have saved enough on disposable and environmentally unfriendly bags to pay for a new vacuum cleaner.
这样的吸尘器完蛋的时候，你从这些一次性的、不环保的袋子上剩下的钱购买一个新的了。
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