Some leaves were floating about on the still lake.

一些树叶漂在宁静的湖面上。

《新英汉大辞典》

Some leaves were floating about on the river.

河面上漂浮着几片树叶。

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Leaves were floating on the surface of the pond.

叶子漂浮在池塘的水面上。

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Leaves were floating on the surface of the pond.

叶子漂浮在池塘的水面上。

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