1·The Yangtze river is a natural barrier to the north-east.
长江是东北方向的一道天然屏障。
—— 《牛津词典》
2·A severe storm destroyed a natural barrier between the house and the lake.
一场猛烈的暴风雨摧毁了房屋和湖泊之间的天然屏障。
—— 《柯林斯英汉双解大词典》
3·The inactive sialic sand-slate is a natural barrier.
活动性差的硅铝质砂板岩形成岩体的天然屏障；
4·The Yangtze River is a natural barrier to the northeast.
长江是东北面的一道天然屏障。
5·The river is a natural barrier between the two countries.
这条河是这两个国家之间的天然屏障。
6·But the canal overcame the natural barrier of those mountains.
但是，伊利运河克服了这些山脉所设置的天然屏障。
7·The mountain forms a natural barrier between the two countries.
这座山构成了两国之间的天然屏障。
8·The skin loses its natural barrier to protect against sunlight.
皮肤失去了防护阳光的自然屏障。
9·The Sahara Desert is a natural barrier between North and Central Africa.
撒哈拉沙漠是北非与中非之间的天然屏障。
10·Wujiang River is a military river that has always been known as a natural barrier.
乌江是一条军事河流，历来被称作天险。