求翻译：有很多细小微粒达到纳米级别但由于粉体在烧结时出现了团聚，因此微粒平均尺寸较大是什么意思？

Many small particles of nanometer-scale powders during sintering, the reunion, so the particle average size

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But has very many tiny particles to achieve a nanometer rank because powder body in agglutination time appeared the reunion, therefore the particle intermediate size is big

Has a lot of tiny particles at nano-level but there was a reunion because of powder sintering, average size of particles larger

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