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 .
