In this paper low-frequency vibration problems of rotating machinery are investigated.

应用时频分析方法研究了回转机械低频振动问题。

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Why not reuse water and paper to live a low-carbon life?

为什么不重复使用水和纸张，去过低碳生活呢？

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Paper had already existed in China, but the process for producing it was difficult and the paper was of low quality.

中国已经有纸了，但是生产纸的过程很困难，而且纸的质量也很差。

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They put it in a pretty low impact paper.

他们把它发表在一个影响力很低的杂志上。

麻省理工公开课 - 化学原理课程节选

In addition, in terms of conveying content, we prepared a notebook, where we had all the teaching materials that Professor Low used in this lecture on paper.

另外，从传递信息而言，我们准备了一个笔记本，其中包括Low教授课上,用到的所有教学资料。

麻省理工公开课 - 媒体、教育、市场课程节选

Today's dividend yield is uncompetitive with municipal paper and low-grade corporates and is subject to cutbacks like GE's.

FORBES: Risks Skewered To The Downside

All of them got into trouble with their investment portfolios last year, particularly in commercial real estate, mortgage paper and low-grade corporate bonds.

FORBES: Magazine Article

Just over a year later I came across that scribbled piece of paper and low and behold I had achieved eight of the ten goals.

FORBES: What's In Store For 2013?