通过采用一种叫电解抛光的技术来溶解金属的表层，使得海绵中球体间隙的连接被扩大了。
The connections between the spherical gaps in the sponge are then enlarged, using a technique called electropolishing to dissolve the surface layer of the metal.
通过采用一种叫电解抛光的技术来溶解金属的表层，使得海绵中球体间隙的连接被扩大了。
The connections between the spherical gaps in the sponge are then enlarged, using a technique called electropolishing to dissolve the surface layer of the metal.
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