有效用英语怎么说

有效用英语可以说是 effective。这个词来源于拉丁语，其中 efficere 意为 "to work out, accomplish"。例如：
This medication is very effective in treating the symptoms of the disease. 这种药物对治疗疾病的症状非常有效。
She has an effective way of dealing with difficult customers. 她有一种处理难客的有效方法。
The teacher's explanation was very effective, and I finally understood the concept. 老师的解释非常有效，我终于明白了这个概念。