Healthy, skin, mucous membranes, and cilia are natural barriers to many viruses.

健康的皮肤, 粘膜和纤毛是许多病毒的天然屏障.

辞典例句

The cable system is ideal for spanning natural barriers of wide rivers, deep valleys, or ravines.

这种钢索体系是跨越宽河道 、 深丘谷或深山谷天然障碍物的理想体系.

辞典例句

The mountains on both sides are natural barriers embracing a naval base inside.

它就像一座天然的屏障,将军港环抱在臂弯之中.

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