Cook speculated that this phenomenon, which became known as the black-drop effect, was caused by "an atmosphere or dusky cloud round the body of the planet."

这个现象后来被称为「黑滴效应」，库克猜测是由「金星周围的大气或尘埃云」造成的。

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Cook speculated that this phenomenon, which became known as the black-drop effect, was caused by "an atmosphere or dusky cloud round the body of the planet."

这个现象后来被称为「黑滴效应」，库克猜测是由「金星周围的大气或尘埃云」造成的。

youdao