If there is no charge on the plate, these droplets will simply fall under gravity.

如果在板子上没有电荷，这些液滴就只会由于重力掉下。

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Storms come and go, lake levels rise and fall, but all obey lord gravity.

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We have a cultural picture in our head of Isaac Newton as an upstanding British gentlemen who discovered gravity by having an apple fall on his head.

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"We've gone through those data to see if we can see any influence of gravity on the positions at which they annihilate - looking for atoms to fall for the short amount of time they exist before they hit the wall, " he told BBC News.

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