题目

英语翻译
Therefore in order to maintain an acceptable velocity through the preheaters at rates less than flowsheet it is normal to reduce the slurry strength once the slurry flowrate has been reduced to the minimum that is acceptable to the pumps.另外at rates less than 看不懂呢

提问时间：2021-12-13

答案

因此,为保证在使用预热器,且费用低于流程时,能保持一个可接受的速度,通常当泥浆流量减少至泵的可以接受的程度时,开始降低泥浆强度.
有些专业词汇翻译不准确,但大体上应该是这个意思.
at a retes less than 是指在低于...的费用下