particle gradation的用法和樣例：
例句
- Its main work includes the Yellow River sediment cross-section tests, river bed surface quality sampling and particle size distribution analysis and so on.
其主要工作內容包括黃河河道斷面淤積測驗，河道表層河床質(zhì)取樣及顆粒級配分析等工作。 - The improvement of cement particle distribution and heating intensity during clinker burning could also improve the performance of cement for pipe pile manufacturing.
改善水泥顆粒級配和提高煅燒熱力強度均能改善管樁水泥的性能。
