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For the marriage gauze, often yarn series "layer" this concept is very important.
对于纱系列的婚纱，往往“层”这个概念很重要。
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This is the concept of the sandwich layer.
这是夹心层的概念。
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The concept of structure layer life matching;
结构层寿命匹配的概念；
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The concept of structure layer life matching;
结构层寿命匹配的概念；
youdao