material bed的用法和样例：
例句
- The critical ratio of inflow mainly depends on the constructional parameters and packed bed conditions of PSF.
临界流入风量比主要取决于结构参数和料层情况。 - Considering the fluidization quality of the system, proper selection of static powder bed height and powder outlet relative height was very critical.
在权衡流化质量的基础上，粉体静止料层高度和出粉口相对高度的选取至为关键。
