The worst turbulence is associated with thunderstorms and they are visible to the naked eye or with weather radar which picks up the size of water droplets.

最恶劣的乱流还伴有雷暴雨，肉眼或天气雷达可以发现。天气雷达可以估测出雨滴的大小。

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Space weather forecast chief Bob Rutledge said given the size of the solar storm, the lights probably shouldn't have been visible south of Iowa.

太空气象预测中心的负责人鲍勃·拉特利奇说考虑到太阳风暴的大小，在爱荷华州的南部应该是看不到极光的。

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But despite its small size, blooms of plankton are visible from space and can sustain billions of Marine creatures.

虽然它的体积很小，但是密集孳生的浮游生物在太空中都看得见，而且能够供养数十亿的海洋生物。

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His finished model now can magnify images up to 300 times the size visible to the naked eye.

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But reducing the size of less healthy foods by elongating the packages makes the size reduction less visible, which should make choosing a smaller size more tempting.

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This time they wanted a visible version and Neal was the right size.

NEWYORKER: Gravel