In the dark gray gutter to the left of the text area, double-click to create a breakpoint. It looks like a little blue circle, as you can see in Figure 6.
在文本区域左边的深灰色槽中，双击创建一个断点。
Thus more than 90 per cent of the light is contained within the circle bounded by the second dark ring.
这样，有90％以上的光落在第二暗环所包围的圆面积之内。
Composed primarily of ices, most comets circle the dark fringes of the solar system, barely within the sun's gravitational grasp.
大部分彗星主要由冰块构成，环绕太阳系黑暗的边缘运行，几乎超出了太阳的引力范围。
Composed primarily of ices, most comets circle the dark fringes of the solar system, barely within the sun's gravitational grasp.
大部分彗星主要由冰块构成，环绕太阳系黑暗的边缘运行，几乎超出了太阳的引力范围。
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