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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。