四年前在同一段铁轨上也发生过类似的事故。
There was a similar accident on the same stretch of track four years ago.
接着，在同一段往后看。
是否在同一段落内多次重复使用了同一个词语或者词组？
Have you used the same word or phrase too many times within a paragraph?
科学家们认为人们在同一段时间只能专注于一个想法。
Scientists believe that you usually attend to one idea at a time.
科学家们认为人们在同一段时间只能专注于一个想法。
Scientists believe that you usually attend to one idea at a time.
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