You might imagine they are like clouds floating across the sky, or waves on the ocean rising and falling.

你可以把它们想象成漂浮在天空的云朵，或者是海面上起起落落的波浪。

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Autumn dusk, floating patches of dead leaves. Piece of the falling yellow leaves are always people feel sad and depressed.

秋天的黄昏，飘着片片枯叶。片片飘落的黄叶，总是让人感到伤感、忧郁。

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She sat beside the window, watching the falling leaves floating in the air.

她坐在窗旁，看着纷纷落下的叶子在空中飘舞。

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The innovation is in the engineering of a racking system and floating structure that can accommodate water rising and falling.

FORBES: Solar's New Twist: Panels That Float On Water

Next year Mexico's economy will be much more strongly placed than it was in 1994, with less debt falling due, a smaller current-account deficit, and a floating currency instead of a fixed one.

ECONOMIST: Mexico