Fracture analysis by the scanning electron microscope shows that grain growth can be effectively inhibited and product properties highly improved by adding appropriate amount of foreign elements.
扫描电镜断口分析表明：掺杂可以控制晶粒生长，提高材料的性能。
Adding appropriate fluorine to drinking water for children under 11 years old in the area with moderate amount of fluorine should be suggested.
建议饮用氟浓度适宜水的11岁前少年儿童饮用适量加氟的水。
The coating agent was prepared by adding PU solution to the appropriate amount of chitosan solution while adjusting the viscosity and then applied to fabrics through transfer coating technique.
采用聚氨酯(PU)树脂溶液添加到适量的壳聚糖溶液中，同时调整粘度至所需涂布的粘度，经转移涂层工艺加工成PU涂层织物。
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