polycrystalline structure的用法和樣例：
例句
- The projection of KPB crystal structure and schematic diagram of twinning structure have been drawn.
我們繪制了該晶體的結構投影圖和孿晶結構示意圖。 - Palygorskite is one of layered and chained structure silicate, it has unique crystal needle structure and is a potential one dimension nano-intensifier.
摘要坡縷石是一種層鏈狀硅酸鹽礦物，具有獨特的納米棒晶結構，是一種很有潛力的一維納米增強材料。
