其外观为多根纤维单丝交聚而成的束状结构。
Its appearance is beam-like structure with many monofilament fiber collecting.
所述的支架为生物降解材料制备的由微丝组成的束状微丝结构，其外表面包覆一层膜，形成管状支架。
The cradle is made from biological degradation material and has fasciculation and micro filament structure. The outside is coated by film. Thus, it forms tubular cradle.
对于大型自由结构，如大型运载器，要实现自由状态下的模态试验是愈来愈困难了。为此，人们被迫只好对这类结构进行约束状态下的模态试验。
For large scale free structure with very great weight, such as a large and heavy-duty launch-vehicle, the free-free modal test is realized difficultly.
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