1. These products have very compact structure , low apparent porosity , high refractoriness , and excellent corrosion resistance. 该产品具有组织结构致密、显气孔率低，耐高温、耐侵蚀能力强等特点。
2. It is very important to get a correct concept of the antidepressants because of high incidence and refractoriness of depression. 抑郁症的发病率高并且难以根治，因此正确了解、认识和应用抗抑郁药物非常重要。
3. The thermal conductivity of these materials has increased considerably, demanding materials with high refractoriness and low thermal conductivity as a back-up lining. 这些材料的热导率增加很多，作为背衬要求材料具有耐火度高和热导率低。
