短语词组短语boron n plastic 含硼塑料boron fibre reinforced plastic 硼纤维增强塑料Boron Fiber Reinforced Plastic 硼纤维增强复合材料neodymium -iron-boron plastic magnet 钕铁硼系塑料磁体boron -in-plastic 含硼塑料 返回 boron plastic