... underwater driving 水底打桩 underwater gradient 水底坡度 underwater guide 水下引体 ...
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... 海底平原 submarine plain 海底坡度 underwater gradient 海底泉 submarine spring ...
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The effects on the underwater sound attenuation by the thickness and concentration gradient of polymers were measured in a sound tube at different frequency during the polymers dissolution process.
文中详细研究了梯度高分子溶液在不同频率下，聚合物厚度及梯度结构的变化对反射声衰减效果的影响。
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