Cách sử dụng
Duckweed is a type of small floating plant that grows in ponds, lakes or slow-moving streams. It looks like tiny green leaves or floating duck feathers. Duckweed is often used as a food source for animals such as fish or ducks, and in some countries it is eaten by people too. The word 'duckweed' can be used in sentences like "There's a lot of duckweed in the pond" or "The ducks are eating the duckweed".