问题: focus on和center on 都译为“集中于。。。”，在具体语句中用法一样吗？可以互换吗？
解答:
可以, 当表示"集中于..."时, focus on和center on 是同义的,如下两句话的意思是相同的:
These proceedings center on failures of constructed environments.
These proceedings focus on failures of constructed environments.
注:
The verb center has 3 meanings:
Meaning #1: center on
Synonyms: focus on, revolve around, revolve about, concentrate on
Meaning #2: focus one's attention on something
Synonyms: concentrate, focus, centre, pore, rivet
Meaning #3: move into the center
Synonym: centre
Also see: center on (meaning #1)
参考文献：Thesaurus synonyms of center
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