The world it's said has shrunk or become flat.

人们都说世界正在不断地变小，变得平坦。

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After several weeks, the plant will become flat and dry.

若干个星期后，植物会变扁或变干。

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Oil painting removed light and shadows, so become flat painting, now those pictures became just oil painting Chinese pictures.

油画除去了光影，所以成了平涂，现在看那些画也就是用油画画的中国画而已。

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However,snow can become hard and flat as it becomes older or if there have been strong winds.

VOA: special.2010.01.05

Their voices become flat, boring and monotone.

FORBES: What Do I Do With My Hands? -Media Training

And since there were one-family houses selling in Union for a Depression low of a few thousand dollars, he would be able to realize an ambition he had nurtured growing up penniless in a Newark tenement flat: to become an American homeowner.

NPR: Roth Rewrites History with a 'Plot Against America'

Despite the convenient Hotel de Ville metro station just near my flat, I have become one of the growing number of militant Paris cyclists, cycling to work and back every day up the Rue de Rivoli and then back home on the Rue de Faubourg-St Honore.

BBC: Caroline Wyatt cycling through Paris