与美国小学生一起学英文第7册 第24期:堤
时间：2018-04-17 01:45:49
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（单词翻译）
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
cement1. 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。
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