pneumatic conveying of solids

例句：

1. 1. The pneumatic conveyoris used to transport heavy materials.
   气动输送器用于运输重物。
2. 2. Thepneumatic toolis designed for easy cleaning andmaintenance.
   气动工具设计用于易于清洁和维护。
3. 3. The pneumatic system iscrucial for the operation of the factory.
   气动系统对于工厂的运行至关重要。