求翻译：餐厅之所以能存货这么多年，顾客量大，是因为餐厅不仅一直改进食品，吸引更多的顾客，同时留住老客户，也注重服务水平的提高。是什么意思？

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The restaurant has been able to stock so many years, the customers large quantities, because the restaurant is not only a food has been improved, in order to attract more customers and retain existing customers, but also focus on improving the level of service.

The dining room the reason that can store goods such many years, the customer measures in a big way, is not only because the dining room improves food continuously, attracts more customers, simultaneously detains the old customer, also pays great attention to the service level the enhancement.

Restaurant is in stock for so many years, large customers, is because the restaurant is not only improve food, attract more customers, and retaining customers, also focus on the improvement of services.

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