The top portion of the shoe, or the upper, is usually made of leather, synthetic leather, or a combination of materials.
鞋的顶端部分就是鞋面，通常由皮革、合成革或者是材料的组合。
Figure 3 shows how the sulfated oil portion of this fatliquor, which was labeled with radioactive sulfur, is distributed through leather.
如图3所示，加酯剂中用放射性同位素硫标记的磺化油部分分散在皮革中。
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