“屏障”造句

人体的免疫系统是抵御疾病的主要屏障。
The immune system is our main defence against disease.

这些人造屏障将会确保提供高度的保护。
These man-made barriers will ensure a very high degree of protection.

燕山是北京的天然屏障.
The Yanshan Hills provide a natural defence for Beijing.

• #屏障