（danger foreign matters）混入棉花中的对棉花加工、使用和棉花质量有严重影响的硬杂物和软杂物，如金属、砖石及化学纤维、丝、麻、毛发、塑料绳、布块等异性纤维或色纤维等。
相对于试样心部的夹杂物，表层夹杂物对实验钢的疲劳性能的危害性更大。
Non-metallic inclusions on the subsurface of specimen do great harm to its fatigue property than that in the centre of specimen.
另外介绍了母材缺陷分层、夹杂物、带状组织对ERW焊缝的危害性。
In addition, it is introduced that the layer, impurities and band structure in base material are harmful to the weld quality of ERW steel pipe.
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