When pouring molten glass onto the molten tin, the underside of the glass would also be perfectly flat.

当把玻璃液倒在锡液上时，玻璃的底面也会变得完全平整。

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The rest of the concept relied on gravity, which guaranteed that the surface of the molten metal was perfectly flat and horizontal.

其余的概念依赖于重力，它保证了熔融金属的表面是完全平坦和水平。

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Perfect balance isn't possible. Almost no one can float perfectly flat or horizontal in the water. But trying to stay as balance as possible is extremely important to fast swimming.

要做到完美的平衡是不可能的，几乎没有人能够完美地水平漂浮在水面上，不过，能够尽量平衡地呆在水面上对于游泳的速度至关重要。

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Set the flat end on a perfectly flat surface, and a bubble of air points straight up.

FORBES

For most Norwegians, the best income distribution curve is a perfectly flat one.

FORBES: Capitalism is contagious

In Thirty Are Better Than One, the Mona Lisa is reduced to a pattern, like paisley or toile de jouy: perfectly flat, potentially infinite.

FORBES: If Every Artist Were As Good As Andy Warhol, Forgery Would Be Unnecessary [Book Excerpt]