In his whisked blood there was not a black drop.

他那浸透威士忌酒的血管里没有一滴邪恶的血液。

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It is important to add only the amount of black drop needed. Side and bottom masking determined by the amount of black drop and image size.

如果需要的话，应该增加黑滴的数量，这点很重要。侧部和底部遮蔽是由黑滴数量和图像尺寸决定的。

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Over half of black males in the inner cities drop out of school without graduating.

城市贫民区有超出半数的男性黑人毕业前离校；

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They concluded that the black drop results from blurring of the image (whether from Earth's atmosphere, or inevitable imperfections of the telescope) combined with the way that the disc of the sun fades in brightness towards its rim.

ECONOMIST: Transits of Venus

The 23% Black Monday drop in 1987 left a divot that was quickly filled in.

FORBES: Magazine Article

There is also historical research to be done: for instance, what causes that meddlesome black-drop effect?

ECONOMIST: Transits of Venus