Based on the analysis, the new concept of two-stage riser fluid catalytic cracking (TSRFCC) was proposed, and the advantage of the TSRFCC technology was analyzed.

在此基础上，提出了两段提升管催化裂化新概念，并分析了其技术优势。

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When Stevie Wonder, whom she was escorting to the stage at a rally in February, tripped on a riser, sending her tumbling down next to him in front of thousands of people, she exhibited no embarrassment or alarm, turning what could have been a blooper-reel nightmare into a non-event.

NEWYORKER: The Other Obama