For the past few years this has remained relatively constant—buoyed partly by the weak pound—but, as the chart shows, the trend over the decade to 2007 was slightly downward.
在过去的几年当中，这一点保持的相当稳定—浮动部分是由于英镑的疲软导致的—但是，如图表所示，在到2007年的十年间，(整体)趋势有一点的下滑。
As the chart shows, the share of food samples that exceed the maximum residue limits (MRLs) in Europe has remained constant for many years.
如图表显示，食品抽检中，欧洲农残超标比例多年来一直居高不下。
Based on the basic equation of A. C. exciting alternator, the vector chart and power flow chart of the alternator are studied, and a method of variable-speed and constant frequency (VSCF) is proposed.
从交流励磁发电机的基本方程出发，通过对其矢量图和功率流程的研究，提出了变速恒频的实现方法。
Based on the basic equation of A. C. exciting alternator, the vector chart and power flow chart of the alternator are studied, and a method of variable-speed and constant frequency (VSCF) is proposed.
从交流励磁发电机的基本方程出发，通过对其矢量图和功率流程的研究，提出了变速恒频的实现方法。
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