They seem to be metal particles that move along certain paths.
看起来是一些沿特定路径移动的金属微粒。
Check the engine tail pipe on metal particles and visible damage.
检查发动机尾喷管无金属颗粒和损坏。
It is recommended to analyse the oil sample for existence of metal particles.
如果发现磁堵上存在金属物质，则推荐取油样化验。
If the wall bear force of the cutting, metal particles from the matrix and erosion.
如果管壁经受不起合力的切削作用，就有金属颗粒脱离母体而流失。
The particles went straight through the metal foil.
粒子笔直地穿过了金属箔。
The particles went straight through the metal foil.
粒子笔直地穿过了金属箔。
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