限制发表文章长度在五到六页期刊页面长度，正如《自然》和《科学》杂志目前所采用的方法，并将同篇文章更长的版本放在该期刊的网站上。

Third, change the length of papers published in print: Limit manuscripts to five to six journal-length pages, as Nature and Science do, and put a longer version up on a journal's Web site.

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而关于预负荷空心圆柱滚动体轴承的研究更是少之又少，到目前为止，在国内的期刊和杂志上还没有发现关于这方面的研究论文。

The researches on the preloaded hollow cylindrical roller bearing are much less, no research paper is found about this aspect in the magazine at home by now.

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