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。

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.

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每个都是17米长的塑胶套子，大部分淹没于水下，由一个浮动的环状装置固定住。

Each is a transparent sheath of plastic 17-metres long, mostly underwater, held in place by a floating collar.

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该图像在右边和底部分别有 18px 的空白，并且浮动在段落文本的左侧。

The image has right and bottom margins of 18px and is floated left in the paragraph text.

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