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Levee
堤
A levee is a system to control water levels.
堤是一种控制水位的系统。
When it rains a lot, floods can happen.
降雨很多时，就可能会发生洪水。
People build walls along rivers or coasts to prevent floods.
人们在河边或海岸边筑堤来防洪。
So, a levee is also called a flood bank.
因此，堤也被称为防洪堤。
People bulid levees with various things.
人们用各种材料来筑堤。
Such as stone, soil or cement.
比如石头、土块或水泥。
However, people sometimes pile sand bags in a flood emergency.
然而，发生洪灾时，人们有时会叠沙包来抗洪。
The parks near seas or rivers also act as levees.
近海或河的公园也起堤的作用。
How does it prevent flooding?
它是怎样防洪的呢？
When it rains a lot, the park is filled with water and this prevent flooding.
下很多雨时，公园里灌满了水，这样也能防洪。
