帮忙翻译一句话? the catalyst flow in the following lift i.e. lift b (from 1st to 2nd reactor) is then adjusted through the relevant pdv in order to maintain the catalyst level in the first upper hopper. the cascade lic / pdv is then set on (lic on first upper hopper, pdv on second lift). note also that this cascade can be overridden by a cascade from the second upper hopper, should the catalyst level in this 3rd upper hopper reach a selected high high level value. 红色的部分怎么翻译?? 查看更多