效

效

"效" means "effect," "imitate," or "to exert."

Here, '效' in '有效' means 'effectiveness' or 'efficacy', showing the idea that the medicine produces a beneficial effect.

这项药物已被证明对这类疾病有效。

This medicine has been proven effective for this type of disease.

In this context, '效' in '效仿' means 'imitate' or 'model after', indicating copying or mimicking successful behaviors or models.

我们应效仿那些成功的企业，学习他们的经验。

We should imitate those successful companies and learn from their experiences.

Here, '效' in '效果' means 'effect' or 'result', focusing on the outcome or impact of actions.

他为实现目标不懈努力，其效果非常显著。

He worked tirelessly to achieve his goals, and the effects are remarkable.