求翻译：Delivering milk to people’s homes is hardly good business, especially when the customer may have a choice of two or three firms serving a single road. In spite of my local difficulties, however, labor troubles are not as great as a few years ago. There are enough men prepared to make an early morning start for the sake of an open-air job with a fair measure of freedom. If they did stop calling, women would find it hard work to collect all the milk they need from self-service stores. Dairies（乳品业）know that stopping deliveries in the United States resulted in falling sales.是什么意思？

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