科诺海洋浮标是一种深海用可加工固体浮力材料(Solid buoyancy material) ，其特点是密度小，强度高，无毒无害无味，吸水率低且稳定，耐候性好等，特别是良好的可加工性和可修补性，可以采用锯、刨、车、...
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The rest of the vertical column is made from a material called syntactic foam - a solid made mostly of hollow "microballoons" - giving it enough buoyancy to float back up.
BBC: James Cameron back on surface after deepest ocean dive
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