Levee
堤
A levee is a system to control water levels.
堤是一種控制水位的系統。
When it rains a lot, floods can happen.
降雨很多時,就可能會發生洪水。
People build walls along rivers or coasts to prevent floods.
人們在河邊或海岸邊筑堤來防洪。
So, a levee is also called a flood bank.
因此,堤也被稱為防洪堤。

People bulid levees with various things.
人們用各種材料來筑堤。
Such as stone, soil or cement.
比如石頭、土塊或水泥。
However, people sometimes pile sand bags in a flood emergency.
然而,發生洪災時,人們有時會疊沙包來抗洪。
The parks near seas or rivers also act as levees.
近海或河的公園也起堤的作用。
How does it prevent flooding?
它是怎樣防洪的呢?
When it rains a lot, the park is filled with water and this prevent flooding.
下很多雨時,公園里灌滿了水,這樣也能防洪。