Duckweed is a stemless , aquatic flowering plant .

浮萍是水生的无茎有花植物。

Duckweed grows across the world except in very cold regions .

浮萍生长在世界各地（除了非常寒冷的地区）。

Jiaxing , china : a boy floats on a river covered by duckweed reuters

中国嘉兴：一男孩漂浮在浮萍覆盖的河面上（路透社）。

In the green firmament of a slough , galaxies of duckweed are stirred by slow moving waters .

在这绿色沼泽的世界里，水中的浮萍像银河系一般在缓缓流动的水中转动着。

If the duckweed covers the surface of a pond , it will deplete the oxygen , killing fish and the submerged plants who will not receive the sunlight for their growth .

如果浮萍覆盖了池塘的表面，就会耗尽氧气，杀死鱼类，使沉水植物因得到不生长所需的光照而死去。