riser catalytic cracking

例句：

1. 1. The riser is responsible for increasing the pressure in the system.
   提升机负责提高系统中的压力。
2. 2. The riser is used to transport fluids from one location to another.
   提升机用于将流体从一个位置输送到另一个位置。
3. 3. The riser is a crucial component of the pipeline system.
   提升机是管道系统的关键组成部分。