论述长石、粘土在陶瓷生产中的作用？
参考答案：
（1）长石在陶瓷生产中的作用：①是坯料中氧化钾和氧化钠的主要来源；起熔剂作用，有利于成瓷和降低烧成温度。②长石熔体能溶解部分高岭土分解产物和石英颗粒，在液相中氧化铝和氧化硅相互作用，促进莫来石生成。③长石熔体填充于各晶体颗粒之间，提高坯体致密度，透明度等。④是釉的主要熔剂⑤起瘠性物料作用。
（2）粘土作用：①其可塑性是陶瓷坯体成型的基础。②使注浆泥料和釉料具有悬浮性和稳定性。③粘土的结合性使坯体具有一定的干燥强度，利于成型加工，烧结。④含有较高的氧化铝，是坯体烧结的主体。⑤是坯体莫来石晶体的主要来源。
In front of my daughter Sindu was a bowl filled with cabbage. She cabbage. She sat there in silence with tears（眼泪）in her eyes. “Sindu, darling, why don’t you a little? Your Mom will shout at me.” Sindu wiped (擦) her tears with the back of her hand. “OK, Dad. I’ll eat, just a .” Then Sindu said: “Dad, if I eat it all, will you give me what I want?” “Yes, within reason.” she began to eat. It took her almost half an hour to finish the . Then she came up to me and said: “Dad, I want to have my head shaved (剃)！” “Sindu, why don’t you something else? If we see you with a clean-shaved head, we will be ,” I said. “But, Dad, you ! Now, you are going back on your words.” I had to my promise. Sindu had all her hair cut off. She looked beautiful On Monday morning, I took her to school. Just as we , a boy got out of a car, and shouted, “Sindu, please wait for me!” Guess what? The boy had hair either. “Sir, your daughter is !” A man got out of the car and said, “That boy is my son Harish. He has cancer. He lost his hair he got ill. Sindu cut hers off, so Harish would feel less . She’s a special girl.” I stood for a while, then said “My little girl, you are me how selfless (无私的) real love is!”
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