For decades, MayDay parades in Moscow have taken place under clear blue skies, aircraft having deposited dry ice, silver iodide and cement powder to disperse clouds.
几十年来，莫斯科的五月节游行都是在晴朗的蓝天下举行的，他们飞机上撒下干冰、碘化银和水泥粉来驱散云层。
To build them, hundreds of ice blocks are shaped and fitted together, with kettles of cold water poured on to "cement"them.
人们把数百冰块打磨砌好，浇上冷水使其凝固成形。
The isograms of the parameters help to find out the cement content and curing duration for the suitable synthetic ice according the requirement of the model test.
由试验结果获得的模型冰物理和力学指标等值图，可作为选择模型冰指标的基础。
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