The Black arrow on each gauge is an indicator telling us our actual measurement in the given time frame.

每个仪表上的黑色箭头指示的是在给定时间段里我们的实际量化指标。

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When you see the black arrow display on the left of the edge and the narrow bounding rectangle, as shown in figure 8, drop the component.

如图8所示，当看到左边缘上显示黑色箭头，并伴有狭长的外接矩形时，放下该组件。

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The cursor changes to a black arrow.

这个指针变成了黑色箭头。

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It is the 40th anniversary this October of the final Black Arrow flight from the Woomera range in Australia and the UK's abandonment of its satellite launch capability.

BBC: Skylon: Ending 40 years of hurt