material bed的用法和樣例：
例句
- The critical ratio of inflow mainly depends on the constructional parameters and packed bed conditions of PSF.
臨界流入風量比主要取決於結構參數和料層情況。 - Considering the fluidization quality of the system, proper selection of static powder bed height and powder outlet relative height was very critical.
在權衡流化質量的基礎上，粉體靜止料層高度和出粉口相對高度的選取至為關鍵。
