顾客寥寥无几的餐厅总是提供一些不新鲜的食物，因为他们很少补充库存。
Restaurants with few customers invariably serve stale food since they seldom replenish their stock.
目前国内关于材料在腐蚀环境低周疲劳性能研究数据很少，这是由于介质具有腐蚀性，对试验设备、试样、试验环境及人员都有很高要求，试验难度很大，试验成功者廖廖无几。
This is because the mediums are corrosive, which has great requests for test equipments, test specimens, the experimental environment and testers. It is big difficulty to carry out the experiment.
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