保证有效用英语怎么说

"Guarantee" 在英文中常用来表示"保证"的意思。例如：
I guarantee that the product is of high quality. (我保证这个产品质量很高。)
The company guarantees that the service will be completed on time. (公司保证服务会按时完成。)
"Effective" 在英文中常用来表示"有效"的意思。例如：
The medication was effective in reducing the symptoms. (药物有效地减轻了症状。)
The training program was effective in improving employee productivity. (培训计划有效地提高了员工的工作效率。)
所以，要用英语表示"保证有效"，可以说"guarantee effectiveness"或"guarantee that something is effective"。例如：
The manufacturer guarantees effectiveness of the product. (制造商保证产品有效。)
We guarantee that the treatment will be effective. (我们保证治疗会有效。)