These sources of positive news feed their motivation at the time, but this motivation does not always last long enough to bring lasting change to their lives.
这些积极信息源的确可以在某些时候给予我们前进的动力，但这种动力难以持续存在并改变我们的生活。
Mary: Let's say you have a document that's several pages long, the multi-sheet feeder will feed the pages one at a time.
玛丽：假如您要复印的文件有好几页长，“多页复印”可以一次性将复印的资料承载下来。
Other dino specialists have likewise argued that long-necked sauropods were unlikely to have had a heart that was big enough to enable it to feed vertically for much of the time.
其他的恐龙专家也有类似的理由，认为长颈蜥脚类动物不大可能拥有一个足够大的心脏从而使它能够长时间地进行垂直进食。
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