一个技术难题是气穴现象，一旦发生气穴现象，位于旋转螺旋桨叶后方的低压会产生气泡。
One technical difficulty is cavitation, where low pressure behind a turning blade causes air bubbles.
化学发泡法制备隔热耐火砖是将发泡剂直接拌入原料中，使其发生化学反应产生气体，在砖内形成小气泡。
Chemical bubbling method is adding bubbling agent into raw material, making the agent reacting with the materials to produce gas and therefore forming small bubble in the brick.
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