1. ef- "out" + fic- => fici- => effici-. 在这里取 out 的引申义：完成、结束(finish, end)之意。
2. meaning: 事情做完了，事情做结束了. => work out, accomplish.
3. => 引申为：事情做完、做结束后的效果。
4. effici- + -ent. => 有效的，有效果的，生效的。=> 高效的，效率高的，有本事的。
5. efficient + -ly.

1. I work very efficiently and am decisive, and accurate in my judgement.

我工作非常有效率，处事果断，而且判断准确。

来自柯林斯例句

2. How do you motivate people to work hard and efficiently?

你是怎样激励大家奋发高效地工作的？

来自柯林斯例句

3. Services could be operated more efficiently and economically.

服务的提供可以更加高效、更加节省。

来自柯林斯例句

4. They seemed able to work together very efficiently.

他们看来能很有效率地合作。

来自柯林斯例句

5. She deals with all the correspondence promptly and efficiently.

她迅速有效地处理全部来往信件。

来自《权威词典》