第二个比较幸运的地方是,遍布全世界的范围内都有一个恒定的垂直磁场。
The second piece of luck is that all over the Earth there is a constant vertical electrical field.
请注意第二个段落的上边框是如何垂直扩展以便与前一段落的底边框相接的。
Notice how the top margin of the second paragraph is extended vertically to meet the bottom margin of the previous paragraph.
另外,图中还显示了两个菜单按钮,第一个在水平标题栏的上边,第二个在垂直标题栏的左边。
One more look at the figure will show two menu buttons, one above the horizontal header and a second to the left of the vertical header.
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