第41章

The echo of his voice filled the cave.
他声音的回波填满了整个山洞
We study ecology to understand the environment
我们学习生态学来了解环境
The country is in a deep economic recession
这个国家正陷入严重的经济衰退
This car is very economical on fuel
这部车的燃料消耗非常节省
He is studying economics at university.
他正在大学里学习经济学
We must practice economy to save money
我们必须节省开支以节省费用
The knife has a sharp edge.
这把刀有一个锋利的刀刃
He edited the manuscript for publication.
他编辑手稿以待发表
The first edition of the book is very rare.
这本书的第一版非常罕见
The editor of the newspaper wrote the editorial.
那家报纸的编辑写了社论