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。

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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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Net migration, which tracks shifts in the population after cancelling out offsetting moves, has remained relatively constant (see chart).

ECONOMIST: Free exchange

"That's the constant challenge that we face - trying to ensure that the official singles chart is the definitive representation of popularity, " Talbot says.

BBC: Charts seek to stay on top after 60 years