英语翻译：
effect; result
例句：
- 只有当演员把台词背得滚瓜烂熟时，我们排戏才会有成效。
Only when the actors have their lines(down) pat can we practice the play effectively.
- 无结果的，无成效的不产生商品或有用结果的
Not productive of a good or useful result.
- 这所学校保证立见成效。
The school promised rapid results.
- 他们提高生产力的措施卓有成效。
Their efforts to improve the production have been very effective.
分词翻译：
成的英语翻译：
become; fully grown; succeed
效的英语翻译：
effect; imitate; render