"It is effective" 可以用英语表示为 "It works" 或 "It is successful".

"Effective" 是形容词，意思是有效的、能产生明显效果的、能够达到预期目的的。

来源：
"Effective" 来自拉丁语 "efficere"，意思是"做到、成功地做到、产生效果"。

英文例句及其中文翻译：

The new marketing campaign has been very effective in attracting new customers.
新的营销活动非常有效，吸引了许多新客户。

The medication has proven to be effective in reducing symptoms of the disease.
这种药物已被证明可以有效地减轻疾病的症状。

The training program has been effective in improving employee productivity.
这个培训计划已经有效地提高了员工的生产率。