The product inside can be peeped through the hollow structure before unwrap the packing.
镂空的结构，令使用者在打开包装前，就能窥视到产品的样貌。
The toughness and hollow structure of Polypropylene Corrugated Sheet can easily be bent and cut.
聚丙烯波形板坚韧而空心的结构使之可以很容易地弯折和切割。
The sealing structure and principle of hollow metal O-ring was introduced.
介绍了金属空心o形圈的密封结构和密封机理。
The structure design of hollow waveguides for ultraviolet laser is studied.
对传输紫外激光用空芯光纤结构进行了研究。
The structure design of hollow waveguides for ultraviolet laser is studied.
对传输紫外激光用空芯光纤结构进行了研究。
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